| CHEMOSPHERE | • chemosphere n. The region of the Earth’s atmosphere (from 20 to 120 miles above the surface) in which photochemical… • CHEMOSPHERE n. the thermosphere, the outermost layer of the atmosphere. |
| HEDGEHOPPER | • hedgehopper n. An aircraft that hedgehops. • HEDGEHOPPER n. a pilot who hedgehops, flies low. |
| HELIOSPHERE | • heliosphere n. (Astronomy) The region of space where interstellar medium is blown away by solar wind; the boundary… • HELIOSPHERE n. the region in space influenced by the sun or solar wind. |
| HENCHPERSON | • henchperson n. A loyal follower or supporter of an individual or group. • HENCHPERSON n. a henchman or henchwoman. |
| HEPTAHEDRON | • heptahedron n. (Mathematics) any polyhedron having seven faces. • HEPTAHEDRON n. a solid figure having several plane faces. |
| 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. |
| HYDROSPHERE | • hydrosphere n. All the liquid waters of the Earth, as distinguished from the land and the gases of the atmosphere. • HYDROSPHERE n. the water of the earth. |
| HYMENOPHORE | • hymenophore n. (Mycology) The part of a fungus fruiting body which produces spore-bearing cells. • HYMENOPHORE n. the fruiting body of some basidiomycetous fungi. |
| 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. |
| RHIZOSPHERE | • rhizosphere n. (Soil science) the soil region subject to the influence of plant roots and their associated microorganisms. • RHIZOSPHERE n. a region of increased biological activity in the neighborhood of a root. |
| 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. |