| Word Part | Definition |
| mono-, uni- | one |
| bi-, di- | two |
| tri- | three |
| quad-, quadri-, tetra- | four |
| centi- | one hundred or one-hundreth |
| milli- | one-thousandth (1/1000) |
| diplo- | double |
| hemi-, semi- | half, partly |
| hyper- | excessive, more than normal |
| hypo- | beneath or below normal |
| multi-, poly- | many |
| nulli- | none |
| pan- | all |
| primi- | first |
| super-, ultra- | excessive |
| ab- | away from |
| ad- | toward |
| ante-, pre- | before in time or in place |
| circum-, peri- | around |
| dia- | through |
| ecto-, ex-, exo-, extra- | out, without, away from |
| en-, end-, endo- | inside |
| epi- | above, on |
| hypo-, infra-, sub- | beneath, under |
| inter- | bewtween |
| intra- | within |
| ipsi- | same |
| meso-, mid-, medio- | middle |
| para- | near, beside, or abnormal |
| per- | through or by |
| post- | after, behind |
| retro- | behind, backward |
| super-, supra- | above, beyond |
| sym-, syn- | joined together |
| trans- | across |
| a-, an- | no, not, without |
| in- | not or inside |
| macro-, mega-, megalo- | large or great (related to size) |
| micro- | small (related to size) |
| ante-, pre-, pro- | before (related to time) |
| post- | after or behind (related to time) |
| anti-, contra- | against (related to description) |
| brady- | slow (related to description) |
| dys- | bad, difficult (related to description) |
| eu- | good, normal (related to description) |
| mal- | bad (related to description) |
| pro- | favoring, supporting (related to description) |
| tachy- | fast (related to description) |
| anter(o) | front |
| poster(o) | back |
| ventr(o) | ventral, belly side |
| dors(o) | back |
| medi(o) | medial, median, middle or nearer the middle |
| later(o) | lateral, farther from the midline of the body or from a structure |
| super(o) | superior, uppermost or above |
| infer(o) | inferior, lowermost or below |
| proxim(o) | proximal, nearer the origin or point of attachment |
| dist(o), tel(e) | far or distant |
| caud(o) | tail |
| cephal(o) | cephalad, toward the head |
| abdomin(o) | abdomen |
| acr(o) | extremities (arms and legs) |
| cephal(o) | head |
| crani(o) | cranium (skull) |
| dactyl(o) | finger or toe |
| encephal(o) | brain |
| herni(o) | hernia |
| omphal(o), umbilic(o) | umbilicus (naval) |
| pelv(i) | pelvis |
| periton(o) | peritoneum |
| pod(o) | foot |
| som(a), somat(o) | body |
| spin(o) | spine |
| thorac(o) | thorax (chest) |
| viscer(o) | viscera (large abdominal organs) |
| hem(a), hem(o), hemat(o), -emia | blood |
| hidr(o) | sweat, perspiration |
| hydr(o) | water |
| muc(o) | mucus |
| py(o) | pus |
| sial(o) | saliva; salivary glands |
| ur(o)(used to describe cells) | urine; urinary tract |
| cellul(o) | little cell or compartment (used to describe cells) |
| chrom(o) | color (used to describe cells) |
| cyt(o), -cyte | cell |
| hemoglobin(o) | hemoglobin (used to describe cells) |
| kary(o), nucle(o) | nucleus |
| morph(o) | shape; form |
| necr(o) | death |
| norm(o) | normal |
| phil(o) | attraction |
| poikil(o) | irregular |
| spher(o) | round |
| calc(i) | calcium |
| kal(i) | potassium |
| natr(o) | sodium |
| coagul(o) | coagulation |
| fibrin(o) | fibrin |
| thromb(o) | thrombus; clot |
| aer(o) | air or gas |
| angi(o), vascul(o) | vessel |
| home(o) | sameness; constant |
| is(o) | equal |
| lith(o) | stone; calculus |
| necr(o) | death |
| -ant | that which causes |
| -ate | to cause an action or the result of an action |
| -cidal | killing |
| -poiesis | production |
| -poietin | that which causes production |
| iatr(o) | physician or treatment |
| idi(o) | individual |
| immu(o) | immunity |
| nos(o), path(o) | disease |
| seps(o) | infection |
| sept(i), sept(o)* | infection; *also means septum |
| bacter(i), bacteri(o) | bacteria |
| staphyl(o) | grapelike cluster, uvula |
| strept(o) | twisted |
| fung(i), myc(o) | fungus |
| vir(o), virus(o) | virus |
| aut(o) | self |
| -phylaxis | protection |
| vascul(o) | vessel |
| aort(o) | aorta |
| arter(o), arteri(o) | artery |
| arteriol(o) | arteriole |
| cardi(o) | heart |
| phleb(o), ven(i), ven(o) | vein |
| venul(o) | venule |
| endocardi(o) | endocardium |
| myocardi(o) | myocardium |
| pericardi(o) | percardium |
| atri(o) | atrium |
| coron(o) | crown |
| mediastin(o) | mediastinum |
| ox(i) | oxygen |
| pulmon(o) | lung |
| sept(o)* | *septum; partition |
| sin(o) | sinus |
| steth(o), thorac(o) | chest |
| valv(o), valvul(o) | valve |
| ventricul(o) | ventricle |
| -ole | small |
| rhythm(o), rrhythm(o) | rhythm |
| de- | down, from, or reversing |
| -stenosis | narrowing; stricture |
| aneurysm(o) | aneurysm |
| ather(o) | yellowish, fatty plaque |
| embol(o) | embolus |
| aden(o) | gland |
| adenoid(o) | adenoids |
| lymph(o) | lymph, lymphatics |
| lymphaden(o) | lymph node |
| lymphangi(o) | lymph vessel |
| lymphat(o) | lymphatics |
| splen(o) | spleen |
| thym(o) | thymus |
| tonsill(o) | tonsil |
| febrile | fever |
| palm | palm |
| plantar | sole (foot) |
| prone | face laying down |
| supine | lying on back |