A list of the most common medical roots with their combining form (vowel)
Aden(o)
gland
Arthr(o)
joint
Bi(o)
life
Carcin(o)
cancer
Cardi(o)
heart
Cephal(o)
head
Cerebr(o) / Encephal(o)
brain
Cyst(o)
urinary bladder
Cyt(o)
cell
Dermat(o) / Derm(o)
skin
Electr(o)
electricity
Enter(o)
intestine, bowel (usually small)
Erythr(o)
red blood cells
Gastr(o)
stomach
Gnos(o)
knowledge
Gynac(o)
female
Hemat(o) / Hem(o)
blood
Hepat(o)
liver
Latr(o)
doctor
Lapar(o)
abdomen
Leuk(o)
white blood cells
Nephr(o) / Ren(o)
kidney
Neur(o)
nerve
Onc(o)
tumor
Ophthalm(o)
eye
Oste(o)
bone
Ped(o)
child
Path(o)
disease
Psych(o)
mind