| HYDROSULPHIDE | • hydrosulphide n. (Britain) Alternative spelling of hydrosulfide. • HYDROSULPHIDE n. a compound formed by action of hydrogen sulphide on a hydroxide. |
| HYDROSULPHITE | • hydrosulphite n. Alternative spelling of hydrosulfite. • HYDROSULPHITE n. a salt of hydrosulphurous acid; esp. the sodium salt, used as a reagent. |
| HYPOCHONDRIUM | • hypochondrium n. (Anatomy) The upper region of the abdomen, below the lower ribs, each side of the epigastrium. • HYPOCHONDRIUM n. either of two regions of the upper part of the abdomen. |
| HYPOSULPHITES | • hyposulphites n. Plural of hyposulphite. • HYPOSULPHITE n. a salt of hyposulphurous acid. |
| HYPOSULPHURIC | • hyposulphuric adj. Alternative spelling of hyposulfuric. • HYPOSULPHURIC adj. denoting a kind of acid. |
| ICHTHYOFAUNAE | • ichthyofaunae n. Plural of ichthyofauna. • ICHTHYOFAUNA n. the fish life of region. |
| ICHTHYOFAUNAL | • ichthyofaunal adj. Relating to ichthyofauna. • ICHTHYOFAUNAL adj. of or relating to ichthyofauna. |
| ICHTHYOFAUNAS | • ichthyofaunas n. Plural of ichthyofauna. • ICHTHYOFAUNA n. the fish life of region. |
| ICHTHYOSAURUS | • ichthyosaurus n. (Archaic) Alternative form of ichthyosaur. • ichthyosaurus n. Any members of the genus Ichthyosaurus. • Ichthyosaurus prop.n. A taxonomic genus within the family Ichthyosauridae – large, extinct marine reptiles. |
| ITHYPHALLUSES | • ITHYPHALLUS n. an erect phallus. |
| SPATHIPHYLLUM | • spathiphyllum n. (Botany) Any plant of the genus Spathiphyllum. • SPATHIPHYLLUM n. any tropical plant of the genus Spathiphyllum, having lance-shaped leaves and fleshy white spadices of flowers in white spathes. |
| SUPERHIGHWAYS | • superhighways n. Plural of superhighway. • SUPERHIGHWAY n. a multilane highway (as an expressway or turnpike) designed for high-speed traffic. |
| UNTHRIFTYHEAD | • UNTHRIFTYHEAD n. (Spenser) unthriftiness, also UNTHRIFTYHED. |
| UNTHRIFTYHEDS | • UNTHRIFTYHED n. (Spenser) unthriftiness, also UNTHRIFTYHEAD. |
| XIPHOPHYLLOUS | • xiphophyllous adj. (Botany) Having sword-shaped leaves. • XIPHOPHYLLOUS adj. having sword-shaped leaves. |