| HEPTAPODY | • heptapody n. (Poetry) A measure or series consisting of seven feet. • HEPTAPODY n. the state of having seven feet. |
| HYDANTOIN | • hydantoin n. (Organic chemistry) The heterocycle imidazolidine-2,4-dione derived from urea and glycolic acid; any… • HYDANTOIN n. a colourless odourless crystalline compound found in beet molasses and used in the manufacture of pharmaceuticals. |
| HYDATHODE | • hydathode n. (Botany) A tissue, in the leaves of many plants, that contains microscopic pores through which water is excreted. • HYDATHODE n. an epidermal water-excreting organ. |
| HYDRATION | • hydration n. (Chemistry) The incorporation of water molecules into a complex with those of another compound. • hydration n. (Biology) The process of providing an adequate amount of water to body tissues. • hydration n. (Construction) The chemical reaction by which a substance (such as cement) combines with water, giving… |
| HYDRATORS | • hydrators n. Plural of hydrator. • HYDRATOR n. something that hydrates. |
| HYDROCAST | • hydrocast n. A form of scientific water measurement in which several connected bottles are lowered into the water… • HYDROCAST n. a gathering of water samples for analysis. |
| HYDROMATA | • HYDROMA n. a watery swelling over a joint, e.g. water on the knee, also HYGROMA. |
| HYDRONAUT | • hydronaut n. An undersea explorer, such as a submariner. • HYDRONAUT n. a person trained to work in an underwater vessel. |
| HYDROPATH | • hydropath n. A hydropathist. • HYDROPATH n. a practitioner of hydropathy, the study of treating diseases with water. |
| HYDROSTAT | • hydrostat n. A mechanism that regulates the amount of water in a boiler. • hydrostat n. (Biology) A muscle tissue, composed mostly of water, that maintains a constant volume during contraction. • HYDROSTAT n. a contrivance or apparatus to prevent the explosion of steam boilers. |
| IDIOPATHY | • idiopathy n. (Pathology) Something idiopathic; a disease having no known cause. • IDIOPATHY n. a disease of unknown origin or one having no apparent cause. |
| TABBYHOOD | • tabbyhood n. (Dated) The state of being an adult female cat (a tabby). • tabbyhood n. (Dated) The state of being a spinster. • TABBYHOOD n. (obsolete) the state of being an old maid. |
| TALLYHOED | • tallyhoed v. Simple past tense and past participle of tallyho. • tally␣hoed v. Simple past tense and past participle of tally ho. • TALLYHO v. to utter a hunting cry. |
| THYLAKOID | • thylakoid n. (Biology) a folded membrane within plant chloroplasts from which grana are made, used in photosynthesis. • THYLAKOID n. any of a membranous disk of lamellae within plant chloroplasts. |
| THYROIDAL | • thyroidal adj. (Physiology) Of, pertaining to, or affecting the thyroid. • THYROIDAL adj. relating to the thyroid gland. |
| TYPHOIDAL | • typhoidal adj. Of, pertaining to, or afflicted with typhoid fever. • TYPHOIDAL adj. relating to typhoid. |
| YOUTHHEAD | • youthhead n. (Obsolete) Youth; youthhood. • YOUTHHEAD n. (obsolete) youth, also YOUNGTH, YOUTHHOOD. |