| BATHYSPHERE | • bathysphere n. A spherical steel deep-diving chamber with perspex windows, in which persons are lowered to the depths… • BATHYSPHERE n. a submersible observation chamber. |
| HEPTAHEDRAL | • heptahedral adj. Having seven plane surfaces. • HEPTAHEDRAL adj. like a heptahedron. |
| HEPTAHEDRON | • heptahedron n. (Mathematics) any polyhedron having seven faces. • HEPTAHEDRON n. a solid figure having several plane faces. |
| HEPTARCHIES | • heptarchies n. Plural of heptarchy. • HEPTARCHY n. government by seven persons; a group of seven allied but independent kingdoms, esp. of Anglo-Saxon England. |
| HETEROPHILE | • heterophile adj. Able to react immunologically with material from another species. • heterophile n. (Immunology) A heterophilic antibody. • HETEROPHILE n. a polymorphonuclear leukocyte in humans that may be stained with dyes, also HETEROPHIL. |
| HETEROPHILS | • heterophils n. Plural of heterophil. • HETEROPHIL n. a polymorphonuclear leukocyte in humans that may be stained with dyes, also HETEROPHILE. |
| HETEROPHONY | • heterophony n. (Music) The simultaneous performance by a number of singers or musicians of two or more versions of the same melody. • HETEROPHONY n. an independent variation on a single melody by two or more voices. |
| HETEROTROPH | • heterotroph n. (Ecology) An organism which requires an external supply of energy in the form of food as it cannot synthesize its own. • HETEROTROPH n. a secondary feeder eating plants or other animals. |
| HYPERSTHENE | • hypersthene n. (Mineralogy) An inosilicate that is an orthorhombic pyroxene. • HYPERSTHENE n. a rock-forming orthorhombic silicate of magnesium and ferrous iron. |
| HYPERTHERMY | • HYPERTHERMY n. an extremely high fever, with a temperature of 41 degrees Centigrade or above, also HYPERPYREXIA. |
| LITHOSPHERE | • lithosphere n. (Geology) The rigid, mechanically strong, outer layer of the Earth; divided into twelve major plates. • LITHOSPHERE n. the solid outer portion of the Earth consisting of the crust and upper mantle, approximately 100 km (62 miles) thick. |
| PHOTOSPHERE | • photosphere n. (Astronomy) A visible surface layer of a star, and especially that of a sun. • PHOTOSPHERE n. the sun's luminous envelope. |
| TEACHERSHIP | • teachership n. The position or role of a teacher. • TEACHERSHIP n. the office of teacher. |
| THEOSOPHERS | • theosophers n. Plural of theosopher. • THEOSOPHER n. a believer in theosophy, immediate divine illumination or wisdom, also THEOSOPH, THEOSOPHIST. |
| THERMOPHILE | • thermophile n. (Biology) An organism that lives and thrives at relatively high temperatures; a form of extremophile;… • THERMOPHILE adj. requiring, or thriving best in, high temperatures. • THERMOPHILE n. a bacteria, plant etc. requiring or thriving in high temperatures, also THERMOPHIL, THERMOPHILIC, THERMOPHILOUS. |
| THEROPHYTES | • therophytes n. Plural of therophyte. • THEROPHYTE n. a plant that overwinters as a seed. |