| Term | Definition |
| hyperacidity | excessive acidity |
| hypoacidity | weak acidity |
| hyperglycemia | excess of sugar in the blood |
| hypoglycemia | abnormally low level of sugar in the blood |
| hypotension | low blood pressure |
| hyperthermia | especially high fever |
| hypothermia | subnormal body temperature |
| hyperthyroid | marked by excessive activity of the thyroid gland |
| hypothyroid | marked by deficient activity of the thyroid gland |
| hyperactive | overactive |
| hyperbole | extravagant exaggeration of statement |
| hypercritical | overcritical |
| hyperemia | superabundance of blood |
| hyperopia | farsightedness |
| hypersensitive | excessively sensitive; supersensitive |
| hypertrophy | excessive growth or development, as of a body part |
| hypodermic | injected under the skin |
| hypothesis | theory or supposition assumed as a basis for reasoning |
| hypothetical | assumed without proof for the purpose of reasoning; conjectural |
| hypertension | abnormally high blood pressure |
| endocrine | secreting internally |
| exocrine | secreting externally |
| endogamy | marriage within the tribe, caste, or social group |
| exogamy | marriage outside the tribe, caste, or social group |
| endogenous | produced from within; due to eternal causes |
| exogenous | produced from without; due to external causes |
| endoskeleton | internal skeleton |
| exoskeleton | hard protective structure developed outside the body, as the shell of a lobster |
| endosmosis | osmosis inward |
| exosmosis | osmosis outward |
| endocarditis | inflammation of the lining of the heart |
| endoderm | membranelike tissue lining the digestive track |
| endoparasite | parasite living on the inside of its host |
| endophyte | plant growing within another plant |
| exoteric | known externally; publicly; readily understandable |
| exotic | introduced from another country; foreign |
| anarchy | total absence of rule or government; confusion; disorder |
| autarchy | rule by an absolute sovereign |
| hierarchy | body of rulers or officials grouped in ranks, each being subordinate to the rank about it; pecking order |
| matriarchy | form of social organization in which the mother rules the family or tribe, descent being traced through the mother |
| monarchy | state ruled over by a single person as a king or queen |
| oligarchy | form of government in which a few people have the power |
| patriarchy | form of social organization in which the father rules the family or tribe, descent being traced through the father |
| geocentric | measured from the earth's center; having the earth as a center |
| geodetic | pertaining to geodesy (mathematics dealing with the earth's shape and dimensions) |
| geography | study of the earth's surface, climate, continents, people, products, etc. |
| geology | science dealing with the earth's history as recorded in rocks |
| geometry | mathematics dealing with lines, angles, surfaces, and solids (measurement of land) |
| geomorphic | pertaining to the shape of the earth or the form of its surface |
| geophysics | science treating of the forces that modify the earth |
| antipathy | aversian; dislike |
| apathy | lack of feeling, emotion, interest, or excitement. indifference |
| empathy | complete understanding of another's feelings, motives, etc. |
| pathetic | arousing pity |
| pathos | quality in drama, speech, literature, music, or events that arouses a feeling of pity or sadness |
| sympathy | sharing of another's trouble; compassion |
| telepathy | transference of the thoughts and feelings of one person to another by no apparent means of communication |
| homeopathy | treatment of disease with minute doses of a remedy that, if given in massive doses to healthy persons, would produce effects like those of the disease |
| osteopath | practitioner of osteopathy (treatment of diseases by manipulation of bones, muscles, nerves, etc. |
| pathogenic | causing disease |
| pathological | due to disease |
| psychopathic | pertaining to mental disease |
| amorphous | having no definite form; shapeless; unorganized |
| anthropomorphic | attributing human form or characteristics to beings not human especially gods |
| dimorphous | occuring under two distinct forms |
| endomorphic | having a form deriving largely from the embryo's inner layer; having a heavy body build |
| heteromorphic | exhibiting diversity of form |
| metamorphosis | change of form |
| monomorphic | having a single form |
| morphology | branch of biology dealing with the form and structure of animals and plants |
| pericardium | membranous sac enclosing the heart |
| perigee | nearest point to the earth in the orbit of a heavenly body |
| perihelion | nearest point to the sun in the orbit of a heavenly body |
| perimeter | whole outer boundary or measurement of a surface or figure |
| periodontics | branch of dentistry dealing with diseases of the bone and gum tissues supporting the teeth |
| peripatetic | traveling about |
| peripheral | oh the periphery; outside or away from the central part, as in peripheral vision |
| peripheral | device that can be attached to or used with a computer such a s a keyboard, moniter, printer, or scanner |
| periphrastic | expressed in a roundabout way; curcumlocutory |
| periscope | instrument permitting those in a submarine a view of the surface |
| peristalsis | wavelike contraction of the walls of the intestines, which propels contents |
| peristyle | row of columns around a building or court |
| peritonitis | inflammation of the peritoneum (membrane lining the abdominal cavity and surrounding the organs within it) |
| geopolitics | study of government and its policies as affected by physical geography |
| geoponics | art or science of agriculture |
| georgic | agricultural |
| geotropism | response to earth's gravity as the growing of roots downward in the ground |
| apogee | farthest point from the earth in the orbit of a heavenly body; culmination |