Veterinary Science Vocabulary

Abomasum

The fourth and true glandular stomach compartment of a ruminant, where enzymatic digestion occurs.

Example: "The          functions much like a monogastric stomach, secreting acid and enzymes."

Abscess

A localized collection of pus walled off within tissue as a result of infection.

Example: "The vet lanced the swollen          to drain the pus."

Active immunity

Long-lasting protection produced when an animal’s own immune system makes antibodies after infection or vaccination.

Example: "Vaccination stimulates          by prompting the animal to make its own antibodies."

Acute

Describing a condition with a sudden onset and short, often severe, course.

Example: "An          illness comes on suddenly, unlike a slowly developing chronic one."

Ad libitum

Feeding that gives an animal continuous free-choice access to feed.

Similar definitions: free-choice

Example: "Hay offered          keeps forage in front of the animal at all times."

Allele

One of the alternative forms of a gene found at a specific location on a chromosome.

Example: "An offspring inherits one          for a trait from each parent."

Alveoli

The tiny air sacs in the lungs where oxygen and carbon dioxide are exchanged.

Example: "Gas exchange takes place across the thin walls of the         ."

Amino acid

An organic building block that links together to form proteins.

Example: "Each          is a subunit that joins with others to build a protein."

Analgesic

A drug that relieves pain.

Similar definitions: painkiller

Example: "The vet gave an          to ease the animal’s pain after surgery."

Anatomy

The study of the structure of the body and the relationships among its parts.

Example: "A vet tech studies          to understand how an animal’s organs are arranged."

Anemia

A deficiency of red blood cells or hemoglobin, reducing oxygen delivery to tissues.

Example: "A heavy parasite load can cause          and pale gums."

Anesthesia

A drug-induced loss of sensation or consciousness to prevent pain during procedures.

Example: "The dog was placed under          so the surgery would be painless."

Anestrus

A period when a female is sexually inactive and not cycling.

Example: "During         , the female shows no heat and will not breed."

Animal behavior

The way an animal acts, including its responses to other animals and its environment.

Similar definitions: ethology

Example: "Understanding normal          helps a handler recognize when an animal is sick or stressed."

Animal welfare

The physical and mental well-being of an animal, including its health, comfort, and ability to express natural behavior.

Example: "Providing shade and clean water supports good         ."

Anorexia

Loss of appetite or refusal to eat, a common sign of illness.

Example: "The sick calf showed          and turned away from its feed."

Anterior

Toward the front or head end of the body; also called cranial.

Similar definitions: cranial

Example: "The chest is located on the          portion of the trunk."

Anthelmintic

A drug that kills or expels internal parasitic worms; a dewormer.

Similar definitions: dewormer, vermifuge

Example: "The herd was treated with an          to control intestinal worms."

Antibiotic

A drug that kills or inhibits the growth of bacteria.

Example: "The vet prescribed an          to treat the bacterial infection."

Antibody

A protein made by the immune system that recognizes and binds a specific antigen.

Example: "After vaccination the body produces a specific          against the pathogen."

Antigen

A foreign substance that triggers an immune response.

Example: "A vaccine introduces a harmless          to prime the immune system."

Antiseptic

A chemical applied to living tissue to kill or inhibit microorganisms.

Example: "The technician scrubbed the incision site with an          before surgery."

Aorta

The largest artery in the body, carrying oxygenated blood away from the left ventricle of the heart.

Example: "Oxygen-rich blood leaves the heart through the         ."

Appendicular skeleton

The bones of the limbs and their supporting girdles.

Example: "The femur and humerus are part of the         ."

Artery

A blood vessel that carries blood away from the heart.

Example: "An          carries oxygenated blood away from the heart to the tissues."

Artificial insemination

A breeding method in which collected semen is manually deposited into the female’s reproductive tract.

Similar definitions: AI

Example: "Using         , a single valuable bull can sire calves in many herds."

Asepsis

The absence of disease-causing microorganisms; a state of being free of contamination.

Example: "Surgical          keeps harmful microbes out of the wound."

Aseptic technique

The procedures used to keep an area free of contamination during surgery or sample collection.

Example: "Using sterile gloves is part of          that prevents surgical infection."

Ataxia

A loss of muscle coordination causing an unsteady, staggering gait.

Example: "The staggering, uncoordinated gait was a sign of         ."

Atrium

An upper receiving chamber of the heart that passes blood to a ventricle.

Example: "Blood returning to the heart first enters an         ."

Auscultation

Listening to internal body sounds, usually with a stethoscope.

Example: "The vet performed          of the chest to evaluate the heart and lungs."

Autoclave

A device that sterilizes instruments using pressurized steam.

Example: "Surgical tools are sterilized in an          using pressurized steam."

Avian

Referring to birds, including poultry.

Example: "An          veterinarian specializes in the care of birds."

Axial skeleton

The bones of the head and trunk, including the skull, vertebral column, ribs, and sternum.

Example: "The skull and spine make up the         ."

Bacteria

Single-celled microorganisms, some of which cause disease.

Example: "Mastitis is often caused by          entering the udder."

Balanced ration

A daily feed allowance that supplies all the nutrients an animal needs in the correct proportions.

Example: "A          provides the right amounts of energy, protein, vitamins, and minerals."

Barrow

A male pig that was castrated before reaching sexual maturity.

Example: "A young castrated male pig raised for market is a         ."

Bile

A digestive fluid made by the liver that helps break down fats in the small intestine.

Example: "The liver secretes          to help digest dietary fat."

Biosecurity

The management practices that prevent the introduction and spread of disease on a farm or facility.

Example: "Requiring visitors to wear clean boots is a basic          measure."

Biotechnology

The use of living organisms or their parts to make products or improve animals and plants.

Example: "Producing insulin from engineered bacteria is an example of         ."

Bloat

A digestive disorder in ruminants in which gas accumulates in the rumen and cannot escape.

Example: "A cow that grazes lush legumes may develop          from trapped rumen gas."

Boar

An intact (uncastrated) male pig used for breeding.

Example: "The          was kept for breeding the sows."

Body condition score

A numeric assessment of an animal’s fat cover used to judge its nutritional status.

Similar definitions: BCS

Example: "A thin cow with a low          may need more energy in her ration."

Bolus

A soft, rounded mass of chewed food ready to be swallowed; also a large pill given to livestock.

Example: "The animal swallows a          of chewed food down the esophagus."

Bovine

Referring to cattle.

Example: "A          veterinarian treats herds of cattle."

Buck

An intact male goat or rabbit.

Similar definitions: billy

Example: "The          was penned separately from the does."

Bull

An intact (uncastrated) mature male of cattle.

Example: "A          is kept to breed the cows in the herd."

Calf

A young bovine of either sex, generally under one year old.

Example: "The newborn          nursed colostrum from its dam."

Canine

Referring to dogs.

Example: "A          patient is a dog."

Capillary

The smallest blood vessel, where nutrients, gases, and wastes are exchanged with tissues.

Example: "Oxygen diffuses from the blood into tissue across the wall of a         ."

Caprine

Referring to goats.

Example: "A          herd is made up of goats."

Carbohydrate

An energy-supplying nutrient made of sugars, starches, and fibers.

Example: "Grain is high in         , the animal’s main energy source."

Cardiovascular system

The body system of the heart and blood vessels that circulates blood.

Similar definitions: circulatory system

Example: "The heart and vessels form the         , which delivers oxygen to tissues."

Carrier

An animal that harbors and can transmit a pathogen without showing signs of disease.

Example: "A healthy-looking          can silently spread the infection to the herd."

Cartilage

Firm but flexible connective tissue that cushions joints and shapes structures such as the ear and nose.

Example: "Smooth          covers the ends of bones where they meet at a joint."

Castration

The surgical removal of the testicles of a male animal.

Example: "A young bull calf undergoes          to become a steer."

Catheter

A thin tube inserted into the body to deliver fluids or drain them.

Example: "An IV          was placed in the vein to deliver fluids."

Caudal

Toward the tail end of the body.

Similar definitions: posterior

Example: "The tail is at the          end of the animal."

Cecum

A pouch at the junction of the small and large intestine; enlarged in hindgut fermenters like horses.

Example: "In the horse, microbial fermentation of fiber occurs mainly in the         ."

Cell

The smallest structural and functional unit of a living organism.

Example: "Every tissue in the body is built from the basic unit called the         ."

Chromosome

A threadlike structure of DNA that carries an organism’s genes.

Example: "Genes are arranged along each          in the cell nucleus."

Chronic

Describing a condition that develops slowly and persists over a long period.

Example: "A          illness lingers for weeks or months rather than resolving quickly."

Clinical sign

An objective, observable indication of disease, such as fever or lameness.

Similar definitions: symptom

Example: "Loss of appetite is a common          of many illnesses."

Cloning

Producing a genetically identical copy of an organism.

Example: "Through         , scientists created a lamb genetically identical to its donor."

Colic

A general term for abdominal pain, most commonly used in horses.

Example: "The horse rolled and pawed from the pain of         ."

Colostrum

The antibody-rich first milk a dam produces after birth that gives the newborn passive immunity.

Similar definitions: first milk

Example: "A newborn calf must drink          soon after birth to absorb protective antibodies."

Concentrate

A feed low in fiber and high in energy or protein, such as grain.

Example: "Corn is a          that adds energy to the ration."

Conception

The successful fertilization of an egg, marking the start of pregnancy.

Example: "A high          rate means most bred females became pregnant."

Confidentiality

The professional duty to keep client and patient information private.

Example: "Maintaining          means not sharing a client’s records without permission."

Conformation

The overall physical structure, shape, and proportions of an animal relative to its ideal.

Example: "A judge evaluates a show animal’s          against the breed standard."

Contagious

Capable of being spread from one animal to another by contact.

Example: "Ringworm is          and can pass between animals through direct contact."

Contraindication

A condition that makes a particular treatment or drug inadvisable.

Example: "Pregnancy is a          for certain dewormers that could harm the fetus."

Cow

A mature female bovine that has produced a calf.

Example: "A          that has calved is milked or nurses her calf."

Cranial

Toward the head end of the body.

Similar definitions: anterior

Example: "The head lies at the          end of the spine."

Crossbreeding

Mating animals of different breeds to combine desirable traits.

Example: "A producer uses          to blend the strengths of two breeds in the offspring."

Crude protein

The estimated total protein in a feed, calculated from its nitrogen content.

Example: "A feed tag lists          to indicate the ration’s protein level."

Cud

A portion of partly digested food a ruminant regurgitates to chew again.

Example: "A resting cow chews her          that she has brought back up from the rumen."

Culling

Removing undesirable or unproductive animals from a herd or flock.

Example: "A producer improves the herd by          animals that fail to breed."

Dam

The female (mother) parent of an animal.

Example: "The calf resembled its          more than its sire."

Dehydration

An excessive loss of body water, often from diarrhea, vomiting, or inadequate intake.

Example: "Persistent scours can cause dangerous          in a young calf."

Dermatitis

Inflammation of the skin, causing redness, itching, or irritation.

Example: "The red, itchy, irritated skin was diagnosed as         ."

Diagnosis

The identification of a disease from its signs, history, and test results.

Example: "The vet reached a          of pneumonia after listening to the lungs."

Diaphragm

The dome-shaped muscle separating the chest from the abdomen that drives breathing.

Example: "Contraction of the          draws air into the lungs."

Digestibility

The proportion of a feed that is absorbed rather than excreted in the feces.

Example: "A forage with high          delivers more of its nutrients to the animal."

Digestive system

The organs that take in, break down, and absorb food and eliminate waste.

Similar definitions: gastrointestinal system

Example: "Food is broken down and absorbed as it passes through the         ."

Disinfectant

A chemical used on surfaces and equipment to destroy microorganisms.

Example: "Pens are scrubbed with a          between groups of animals."

Distal

Farther away from the point of attachment or the body’s midline.

Example: "The hoof is at the          end of the leg, farthest from the body."

Distemper

A highly contagious viral disease of dogs affecting the respiratory, digestive, and nervous systems.

Example: "Puppies are vaccinated against          to prevent the deadly viral disease."

Doe

A mature female goat or rabbit.

Similar definitions: nanny

Example: "The pregnant          was moved to a clean kidding pen."

Dominant

Describing an allele whose trait is expressed even when only one copy is present.

Example: "A          gene masks the effect of its recessive partner."

Dorsal

Toward or on the back or top surface of the body.

Example: "The backbone runs along the          surface of the animal."

Dosage

The amount, frequency, and duration of a drug to be administered.

Example: "The          of the antibiotic was set at twice daily for ten days."

Dry matter

The portion of a feed remaining after all water is removed.

Example: "Comparing feeds on a          basis removes the effect of differing moisture."

Dystocia

A difficult or abnormal birth.

Similar definitions: difficult birth

Example: "The oversized calf caused         , and the vet had to assist the delivery."

Ectoparasite

A parasite that lives on the outside of the host, such as a flea, tick, or mite.

Example: "A tick is an          that attaches to the skin to feed on blood."

Edema

The abnormal accumulation of fluid in tissues, causing swelling.

Example: "Fluid buildup under the skin, called         , made the leg puffy."

Embryo

An early developmental stage of offspring after fertilization but before organs are formed.

Example: "A few days after fertilization, the developing          implants in the uterus."

Embryo transfer

A technique in which embryos are collected from a donor female and placed into recipient females.

Example: "Through         , a prize cow can produce many calves carried by other cows."

Endemic

Describing a disease that is constantly present at a low level in a particular area or population.

Example: "A disease that is always present in a region at a steady rate is         ."

Endocrine system

The system of glands that secrete hormones to regulate body functions.

Example: "Hormones released by the          regulate growth and metabolism."