| HETEROCONT | • HETEROCONT n. a kind of yellow-green alga, also HETEROKONT. |
| HETERODONT | • heterodont adj. (Zootomy) Having teeth of different types (like most mammals). • heterodont adj. (Malacology) Of bivalves or their hinge teeth: having two to three wedge-shaped cardinal teeth set in… • heterodont n. (Zoology) A heterodont animal. |
| HETEROKONT | • heterokont adj. (Biology) Having flagella of unequal length. • heterokont n. (Biology) Any member of the superphylum Heterokonta, most of which are algae. • HETEROKONT n. a kind of yellow-green alga, also HETEROCONT. |
| HORTATIONS | • hortations n. Plural of hortation. • HORTATION n. the act of exhorting. |
| NOTEWORTHY | • noteworthy adj. Deserving attention; notable; worthy of notice. • noteworthy n. A noteworthy person. • NOTEWORTHY adj. worthy of or attracting attention esp because of some special excellence. |
| ORTHOTONES | • ORTHOTONE n. an orthotone word. |
| ORTHOTONIC | • orthotonic adj. Orthotone. • ORTHOTONIC adj. taking an accent in certain positions but not in others, also ORTHOTONE. |
| OTTERHOUND | • otterhound n. Alternative form of Otterhound. • Otterhound n. A dog of a particular breed of scent hound, originating in Britain. • OTTERHOUND n. a hound used to hunt otters. |
| PHYTOTRONS | • phytotrons n. Plural of phytotron. • PHYTOTRON n. an apparatus that produces climates artificially for the study of plant growth. |
| TENTERHOOK | • tenterhook n. One of a series of hooks used to stretch cloth on a tenter. • tenter-hook n. Alternative form of tenterhook. • tenter␣hook n. Alternative form of tenterhook. |
| TOPNOTCHER | • topnotcher n. (Philippines) Alternative form of top-notcher. • top-notcher n. (Colloquial) Something excellent or first-rate. • TOPNOTCHER n. crude oil after some of its lighter constituents have been removed by distillation. |
| TROCHOTRON | • TROCHOTRON n. a trochoidal magnetron, high-frequency counting tube which deflects a beam on to radially disposed electrodes. |