| ECHOGRAPHY | • echography n. (Medicine) The use of ultrasound as a diagnostic aid. • ECHOGRAPHY n. medical examination of the internal structures of the body by means of ultrasound. |
| HATEWORTHY | • hateworthy adj. Worthy of being hated, detestable, despicable. • HATEWORTHY adj. worthy of hate. |
| HEMIMORPHY | • HEMIMORPHY n. the state of having a polar axis, dissimilar at the two ends. |
| HIEROGLYPH | • hieroglyph n. An element of an ideographic (hieroglyphic) writing system. • hieroglyph n. (Informal) Any obscure or baffling symbol. • hieroglyph v. To represent by hieroglyphs. |
| HOBBYHORSE | • hobbyhorse n. Alternative spelling of hobby horse. • hobby-horse n. Alternative spelling of hobby horse. • hobby␣horse n. (Originally) The Irish hobby, an extinct breed of horse. |
| HOMOTHERMY | • HOMOTHERMY n. the maintenance of a constant body temperature, also HOMEOTHERMISM, HOMEOTHERMY, HOMOIOTHERMY. |
| HORNYHEADS | • hornyheads n. Plural of hornyhead. • HORNYHEAD n. a North American river chub. |
| HYDROCHORE | • hydrochore n. A plant whose spores, seeds, or fruits are dispersed by water. • HYDROCHORE n. a plant disseminated by water. |
| HYDROPHANE | • hydrophane n. (Mineralogy) A semitranslucent variety of opal that becomes translucent or transparent on immersion in water. • HYDROPHANE n. a semitranslucent variety of opal that becomes translucent or transparent on immersion in water. |
| HYDROPHILE | • hydrophile n. (Chemistry) Any hydrophilic substance. • hydrophile n. (Zoology) Any organism that thrives in the presence of water. • hydrophile adj. Hydrophilic. |
| HYDROPHONE | • hydrophone n. A transducer that converts underwater sound waves into electrical signals, rather like a microphone. • HYDROPHONE n. an apparatus for listening to sounds conveyed by water. |
| HYDROPHYTE | • hydrophyte n. (Botany) A plant that lives in or requires an abundance of water, usually excluding seaweed. • HYDROPHYTE n. an aquatic plant; an alga. |
| HYDROTHECA | • hydrotheca n. (Zoology) One of the calicles that protect the hydranths in certain Hydroidea (Thecaphora). • HYDROTHECA n. the horny cup of a hydranth. |
| HYETOGRAPH | • hyetograph n. A graphical representation of rainfall over time. • HYETOGRAPH n. an instrument for recording rainfall. |
| HYGROPHILE | • HYGROPHILE n. a plant loving moist places, also HYDROPHILE. |
| HYGROPHOBE | • HYGROPHOBE n. a plant growing best where moisture is scanty. |
| HYGROPHYTE | • hygrophyte n. (Biology) Any plant that thrives on very wet but not submerged ground. • HYGROPHYTE n. a plant adapted to a plentiful water-supply. |
| HYPAETHRON | • hypaethron n. An open court. • HYPAETHRON n. an open court. |
| ORTHOPHYRE | • orthophyre n. (Geology) a porphyritic rock that contains phenocrysts of orthoclase embedded in feldspar. • ORTHOPHYRE n. a fine-grained syenitic rock with orthoclase crystals. |
| THEROPHYTE | • therophyte n. (Biology) Any plant which survives unfavourable seasons in the form of seeds only. • THEROPHYTE n. a plant that overwinters as a seed. |