| A | B |
| hyperacidity | excessive acidity |
| hypoacidity | weak acidity |
| hyperglycemia | excess of sugar in the blood |
| hypoglycemia | abnormally low level ofsugar in the blood |
| hypertension | abnormally high blood pressure |
| hyper | over, above, beyond the ordinary |
| hypo | under, beneath, less than the ordinary |
| hypotension | low blood pressure |
| hyperthermia | especially high fever; hyperpyrexia |
| hypothermia | subnormal body temperature |
| hyperthyroid | subnormal body temperature |
| 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 |
| endocrine | secreting internally |
| exocrine | secreting externally |
| endo | within |
| exo | out of; outside |
| exogamy | marriage within the tribe, caste, or social group |
| endogamy | marriage outside the tribe, caste, or social group |
| endogenous | produced from within; due to internal causes |
| endoskeleton | internal skeleton or supporting framework in an animal |
| 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 tract |
| endoparasite | parasite living on the inside of its host |
| endophyte | plant growing within another plant |
| exoteric | known externally (outside a select group; publicly); readily understandable |
| exotic | 1. introduced from another county; foreign 2. strikingly unusual; strange |