| Term | Definition |
| peri | around |
| pericardium | membranous sac surrounding the heart pericardium |
| periscope | instrument permitting those in a submarine a view of the surface |
| peristalsis | wavelike contractions in the intestines which propel contents onward |
| morph | form |
| anthropomorphic | attributing human form or characteristics to non-human beings |
| metamorphosis | change of form |
| amorphous | without definite shape or form |
| heteromorphic | exhibiting diversity of form |
| monomorphic | having single form |
| morphology | study of the forms of plants and animals |
| path | feeling, disease |
| antipathy | dislike |
| apathy | lack of concern or interest |
| empathy | complete understanding of another's feelings or motives |
| pathogenic | causing disease |
| pathological | due to disease |
| geo | earth, ground |
| geometry | mathematics dealing with lines, angles, surfaces, and solids |
| geopolitics | politics of a region as affected by physical geography |
| geography | study of an areas people, products, climate, culture, etc. |
| apogee | farthest point from the earth in the orbit of a satellite |
| perigee | nearest point to the earth in the orbit of a satellite |
| anarchy | absence of rule or government; chaos |
| hierarchy | body of rulers grouped in ranks, each subordanant to the rank above it |
| matriarchy | social organization in which the mother rules the family or tribe |
| monarchy | ruled by one |
| oligarchy | ruled by few |
| patriarchy | social organization in which the father rules the family or tribe |
| archy | rule |
| exo | outside |
| exocrine | secreting externally |
| exogamy | marriage outside the tribe or social group |
| exogenous | due to external causes |
| exoskeleton | hard protective structure developed outside the body |
| exoteric | easily understood |
| esoteric | difficult to understand |
| endo | within |
| endocrine | secreting internally |
| endogamy | marriage within the tribe or social group |
| endogenous | due to internal causes |
| endoskeleton | internal skeleton or supporting framework in an animal |
| hypo | under, beneath, less than ordinary |
| hypoglycemia | low blood sugar |
| hypotension | low blood pressure |
| hypodermic | injected under the skin |
| hypothesis | assumption used as base of reasoning |
| hyper | over, above, beyond the ordinary |
| hyperglycemia | high blood sugar |
| hypertension | high blood pressure |
| hyperactive | overactive |
| hyperbole | extreme exaggeration |
| hypertrophy | abnormal growth due to excessive use |
| hetero | different |
| heterochromatic | having many different colors |
| heterogenous | differing in kind; dissimilar |
| heteronym | a word that is spelled like another but differing in sound and meaning |
| differing from the traditional | a differing from the traditional |
| homo | same |
| homochromatic | having the same color |
| homogenous | of the same kind; similar |
| homomorphic | having the same form |
| homonym | a word that sounds like another but differs in meaning and spelling |
| homocentric | having the same center |
| pod | foot |
| antipodes | opposite points of the globe and their inhabitants |
| arthropod | invertebrate with jointed legs |
| dipody | line of poetry with 2 feet |
| pseudopod | temporary extension of the protoplasm enabling an organism to move or take in food |
| tomy | cutting |
| anatomy | structure of plant or animal/dissection to study structure of plant or animal |
| appendectomy | surgical removal of the appendix |
| atom | smallest particle of an element |
| atomizer | instrument for reducing to a fine spray |
| dichotomy | cutting or division into two |
| gastrectomy | surgical removal of all or part of the stomach |
| lobotomy | brain surgery to cure certain medical disorders |
| phlebotomy | opening of the vein to remove blood |
| tonsillectomy | surgical removal or tonsils |
| tracheotomy | opening of the trachea or windpipe |