Comprehensive Medical Terminology Study Notes

Origins of Medical Language

  • Origin and purpose: Medical terminology is the language used in healthcare to describe anatomy, structures, conditions, diagnoses, procedures, treatments, and more.
  • Learning strategy: Most medical terms are built from prefixes, roots, and suffixes. Breaking down the word makes meaning clearer.
  • Key historical ideas:
    • Greek and Latin word parts are combined to form medical terms.
    • Origins of medical language include:
    • Eponyms: terms derived from names of people or places (e.g., Apgar score named after Dr. Virginia Apgar; West Nile virus named after the location first identified).
    • Acronyms: formed from the first letters of words in a phrase; usually contain a vowel and are spoken as a word (e.g., laser = light amplification by stimulated emission of radiation).
    • Modern language terms: derived from English (e.g., nuclear medicine scanner).
  • Practical takeaway: Understanding origin helps decode terms and understand connections between terms across disciplines.

Four Word Parts

  • Word Root: fundamental meaning of a medical term; core of the word.
  • Prefix: attached to the beginning; modifies meaning (location, direction, number, quantity, size, color, etc.).
  • Suffix: attached to the end; modifies meaning (disease, disorder, condition, procedure, process, specialty, test, etc.).
  • Combining Vowel: used to ease pronunciation; usually an “o”.

Word Parts and Their Roles

  • Prefix (Beginning / Descriptive):
    • Often indicates location, direction, number, quantity, size, color, etc.
  • Root (Middle / Subject):
    • Often relates to a body part or system; can indicate color (example roots below).
  • Suffix (Ending / Meaning):
    • Indicates disease, disorder, condition, procedure, process, specialty, test, or status.
  • Combining Vowel:
    • Usually inserted between root parts to facilitate pronunciation; typically “o”

Example: Prefix, Root, and Suffix in Hyperthyroidism

  • Hyperthyroidism components:
    • Prefix: Hyper- = Over / In excess
    • Root: thyroid = Thyroid gland
    • Suffix: -ism = Condition (in this context, a medical condition)
  • Definition formed: Condition in which the thyroid gland is overactive.

Word Roots: Common Color Roots

  • Cyan/o = blue (e.g., cyanosis)
  • Erythr/o = red (e.g., erythrocytes)
  • Leuk/o = white (e.g., leukocytes)
  • Melan/o = black (e.g., melanoma)
  • Poli/o = gray (e.g., poliomyelitis)
  • Note: Word roots often describe the involved body part or system, but color roots describe color.

Word Roots: Body Parts (Examples)

  • Myel/o = spinal cord (also bone marrow in some contexts)
  • My/o = muscle
  • Oste/o = bone
  • Neur/o = nerve
  • Arthr/o = joint

Common Prefixes (Key Examples)

  • Ab- = away from; e.g., Abnormal
  • Ad- = toward; e.g., Addiction
  • Hyper- = excessive / above normal; e.g., Hyperthermia
  • Hypo- = decreased / below normal; e.g., Hypotension
  • Inter- = between or among
  • Intra- = within
  • Sub- = under / below
  • Supra- = above
  • Pre- = before
  • Post- = after
  • Prenatal = before birth; Perinatal = around birth; Postnatal = after birth
  • Extra prefixes that can be confusing due to opposite meanings:
    • Ab- vs Ad- (away from vs toward)
    • Hyper- vs Hypo- (excessive vs deficient)
    • Inter- vs Intra- (between vs within) though not direct opposites in all contexts
  • Additional prefixes from later slides:
    • Prefixes related to timing or location: Pre-, Post-, Ante-, Pro-, Re-, Retro-, Neo-, Chrono-
    • Directional prefixes: Intra-, Inter-, Extra- (context dependent)
    • Quantity / size / position: Peri-, Mega-, Micro-, Macro-, Equalities like Iso-
  • Birth related prefixes (examples): Prenatal, Perinatal, Postnatal
  • Prefixes indicating time/number: Uni-, Bi-/Di-/Diplo-, Tri-, Quad-
  • Prefixes indicating degree: Hyper-, Hypo-, Tachy- (fast), Brady- (slow)

Prefixes: Quick Reference to Meaning and Example

  • Ab-: away from; Abnormal
  • Ad-: toward; Addiction
  • Hyper-: excessive; Hyperthermia
  • Hypo-: decreased; Hypotension
  • Inter-: between / among
  • Intra-: within; Intramuscular
  • Sub-: under / below
  • Supra-: above; Supracostal
  • Pre-: before; Prenatal
  • Post-: after; Postoperative
  • Ante-: before (as in antepartum)
  • Pro-: in favor of / before? (Prophylaxis as a context)
  • Re-: again / back
  • Retro-: backward / behind
  • Neo-: new; Neonatal
  • Chrono-: time / chronological order
  • Tachy-: fast; Tachycardia
  • Brady-: slow; Bradycardia
  • Natal root examples: nat- (birth) used in prenatal terms

Word Building and Pronunciation Rules

  • Determining meaning: Start at the suffix and work toward the beginning; identify the meaning of each part; combine to form the definition.
  • Some word parts have multiple meanings; identify the body system the term refers to if needed.
  • Combining vowel rules: Use a combining vowel when the suffix begins with a consonant; do not use if the suffix begins with a vowel.
  • Examples:
    • neur/o + plasty = neuroplasty (nerve surgical repair)
    • cardi + o + logy = cardiology (study of the heart)

Look at Word Parts: Look-Alike Terms

  • Endoarterial: pertaining to the lining within an artery
  • Atheroectomy: surgical removal of a fatty substance (ather/o = fatty substance; -ectomy = surgical removal)
  • Arthralgia: pain in a joint (arthr/o = joint; -algia = pain)
  • Appendectomy: surgical removal of the appendix (append/o = appendix; -ectomy = removal)
  • Colostomy: surgical creation of an artificial opening into the colon (col/o = colon; -ostomy = opening)
  • Lithotomy: surgical incision to remove stones (lith/o = stone; -tomy = cutting/incision)
  • Rhinoplasty: surgical repair of the nose (rhin/o = nose; -plasty = surgical repair)
  • Arthroscopy: visual examination of a joint (arthr/o = joint; -scopy = examination/viewing)
  • Common look-alikes involving root words:
    • Myc/o: fungus; Myel/o: bone marrow or spinal cord; My/o: muscle
    • Pyel/o: renal pelvis; Py/o: pus
    • Pyoderma: pus in the skin; Pyromaniac: person with compulsive fire setting

Word Roots: Additional Examples

  • Mycosis: abnormal condition of fungus
  • Myelopathy: disease in the spinal cord
  • Myopathy: disease of muscle tissue
  • Pyelitis: inflammation of the renal pelvis
  • Pyel/o: renal pelvis / part of kidney

Deciphering Medical Terms (Practice Fragment)

  • Term parts:
    • cardi/o = heart
    • gastr/o = stomach
    • neur/o = nerve
  • Examples:
    • Cardiologist: physician specializing in the heart
    • Gastralgia: pain in the stomach
    • Neuralgia: nerve pain
  • Note: -algia means pain; -logy means study of (as in cardiology)

Prefixes: Numerals, Size, Count, and More (From Quick List)

  • Mono = one; Mononucleosis
  • Uni = one side; Unilateral
  • Bi/Di/Diplo = two; Bipartite / Diplomatic? (context: Bi-/Di-/Diplo- means two or double)
  • Tri = three; Triceps
  • Quad/Quadr = four; Quadriceps
  • Semi = half; Semiconscious
  • Hemi = half / one side; Hemiplegia
  • Equi = equal; Equilibrium
  • Iso = equal; Isocellular
  • Eu = good / normal; Euglycemia
  • Normo = normal; Normotensive

Prefixes: Size, Color, Order, and Time

  • Hyper = excessive / high; Hyperthermia
  • Hypo = deficient / low; Hypoglycemia
  • A/An = without / not; Anoxia
  • Pan = all / total; Pancytopenia
  • Multi = many; Multivitamins
  • Poly = many / much; Polycystic
  • Oligo = few / deficient; Oliguria
  • Micro = small; Microscope
  • Macro = large; Macronutrient
  • Megalo / Mega = large / giant; Megalocephaly

Chromo- and Other Descriptive Prefixes

  • Chromo/Chromato = color
  • Alb = white (albin/o)
  • Chloro = green; Chlorophyll
  • Cyano = blue; Cyanosis
  • Erythro = red; Erythrocytes
  • Glauco = gray / gray-blue opacities (glaucoma refers to eye condition with opacities)
  • Leuko = white; Leukocytes
  • Melano = black; Melanoma
  • Polio = gray matter (spinal cord) or inflammation context; Poliomyelitis
  • Porphyr = purple hue; Porphyritic
  • Rhodo = red / rose; Rhodolite gemstones
  • Xantho = yellow; Xanthochromia

Temporal and Positional Prefixes

  • Pre = before / in advance
  • Post = after
  • Ante = before
  • Pro = for / forward / in front
  • Re = again / back
  • Retro = backward / behind
  • Neo = new / recent
  • Chrono = time / chronological order
  • Tachy- = fast; Tachycardia
  • Brady- = slow; Bradycardia

Medical Suffixes: Procedures

  • -ostomy = create opening
  • -otomy = make an incision / cut into
  • -centesis = puncture / aspiration
  • -plasty = surgical repair
  • -scopy = visual examination / viewing
  • -otripsy = crushing procedure
  • -desis = bind / fuse together
  • -ectomy = excision / removal
  • -osis / -itis / -algia etc. in other categories
  • Examples:
    • Colostomy (col/o = colon; -ostomy = opening)
    • Laparotomy (lapar/o = abdomen; -tomy = incision)
    • Nephrectomy (nephr/o = kidney; -ectomy = removal)
    • Arthroscopy (arthr/o = joint; -scopy = viewing)
    • Rhinoplasty (rhin/o = nose; -plasty = repair)
    • Pericardiocentesis (peri-/cardi/o-/centesis; puncture to remove fluid around the heart)

Medical Suffixes: Tests and Recordings

  • -gram = record / image / picture
  • -graphy = process of recording
  • -graph = instrument used to record
  • Examples:
    • Electrocardiogram (ECG) / Electrocardiography / Electrocardiograph

Medical Suffixes: Signs & Symptoms

  • -itis = inflammation
  • -algia = pain
  • -odynia = pain
  • -paresis = weakness
  • -plegia = paralysis
  • -rrhea = discharge / flow
  • -edema = swelling
  • -rrhage / -rrhagia = excessive flow / discharge
  • -arthr/algia = arthralgia (joint pain)
  • -ce phal? Cephalgia = headache
  • -vasospasm = spasm of blood vessels
  • -hemorrhage = bleeding

Medical Suffixes: Descriptive and General

  • -megaly = enlargement
  • -icle = small / microscopic
  • -constriction = narrowing / constriction
  • -dilation = expansion / widening
  • -eurysm = dilation / bulging (aneurysm)
  • -genesis = development / production
  • -stasis = stopping / controlling
  • -genic = caused by / produced by
  • -ology = study of
  • -ology suffixes also include -ology, -logy for study of a field
  • -oma = tumor
  • -pathy = disease / disorder
  • -osis = condition / disease
  • -penia = deficiency
  • -pnea = breathing
  • -emia = blood condition

Practice and Quick Checks

  • Write It exercise (examples):
    1) Gastritis or gastrosis = inflammation of the stomach.
    2) Appendectomy or appendicitis = surgical removal of the appendix.
    3) Arteriosclerosis = abnormal hardening of arterial walls. (Note: arterionecrosis would be another term in some contexts.)
    4) Inflammation of stomach and small intestine = gastroenteritis (gastritis would be inflammation of stomach; gastralgia is pain).
    5) Pain in a joint = arthralgia (arthritis is joint inflammation).

Spelling and Communication

  • Correct spelling is essential: misspelling can change meaning and pronunciation.
  • Spelling accuracy reduces miscommunication in clinical settings.

Summary: How to Approach Medical Terminology

  • Learn root words as the core meaning, then attach prefixes and suffixes to modify meaning.
  • Determine the body system by analyzing roots and suffixes, especially when roots have multiple meanings (e.g., myel/o can be spinal cord or bone marrow).
  • Use combining vowels to facilitate pronunciation, but omit when suffix begins with a vowel.
  • Practice with real-world examples: building terms from components (e.g., oste/o + arthr + itis = osteoarthritis).
  • Use look-alike terms as reminders of common roots and suffixes (e.g., endo-arterial vs. atherectomy) to avoid confusion.

Resources Mentioned

  • CDC and NIH websites listed as reliable sources for disease information and terminology references (CDC, nih.gov, NIH).