| HETEROPHYLLOUS | • heterophyllous adj. (Botany) Having leaves of different types upon the same plant. • HETEROPHYLLOUS adj. having the foliage leaves of more than one form on the same plant or stem. |
| HYDROSULPHATE | • hydrosulphate n. Alternative form of hydrosulfate. • HYDROSULPHATE n. any quaternary acid salt formed by addition of an organic base to sulphuric acid, such as aniline hydrosulphate. |
| HYDROSULPHATES | • hydrosulphates n. Plural of hydrosulphate. • HYDROSULPHATE n. any quaternary acid salt formed by addition of an organic base to sulphuric acid, such as aniline hydrosulphate. |
| HYDROSULPHITE | • hydrosulphite n. Alternative spelling of hydrosulfite. • HYDROSULPHITE n. a salt of hydrosulphurous acid; esp. the sodium salt, used as a reagent. |
| HYDROSULPHITES | • hydrosulphites n. Plural of hydrosulphite. • HYDROSULPHITE n. a salt of hydrosulphurous acid; esp. the sodium salt, used as a reagent. |
| HYPERTROPHOUS | • hypertrophous adj. (Dated, medicine) Hypertrophic. • HYPERTROPHOUS adj. of an organ, abnormally enlarged. |
| HYPOSULPHATE | • hyposulphate n. (Inorganic chemistry) Alternative form of hyposulfate. • HYPOSULPHATE n. a dithionate. |
| HYPOSULPHATES | • hyposulphates n. Plural of hyposulphate. • HYPOSULPHATE n. a dithionate. |
| HYPOSULPHITE | • hyposulphite n. Alternative spelling of hyposulfite. • HYPOSULPHITE n. a salt of hyposulphurous acid. |
| HYPOSULPHITES | • hyposulphites n. Plural of hyposulphite. • HYPOSULPHITE n. a salt of hyposulphurous acid. |
| HYPOTHENUSE | • hypothenuse n. Dated form of hypotenuse. • HYPOTHENUSE n. the longest side of a right-angled triangle, also HYPOTENUSE. |
| HYPOTHENUSES | • hypothenuses n. (Dated) plural of hypothenuse. • HYPOTHENUSE n. the longest side of a right-angled triangle, also HYPOTENUSE. |
| HYSTERANTHOUS | • hysteranthous adj. (Botany) Having the leaves emerge after the flowers have opened. It typically refers to geophytes that… • HYSTERANTHOUS adj. having the leaves appearing after the flowers. |
| ICHTHYOSAURUSES | • ICHTHYOSAURUS n. a large fossil marine reptile, also ICHTHYOSAUR, ICHTHYOSAURIAN. |
| MERRYTHOUGHTS | • merrythoughts n. Plural of merrythought. • MERRYTHOUGHT n. the furcula between the neck and breastbone of poultry, aka wishbone. |
| PHENYLTHIOUREAS | • phenylthioureas n. Plural of phenylthiourea. • PHENYLTHIOUREA n. a crystalline compound used to test for the presence of a certain dominant gene (the compound tasting bitter to those who possess the gene). |
| THERMOPHYLLOUS | • THERMOPHYLLOUS adj. having leaves only in the warmer part of the year, deciduous. |
| THOUGHTLESSLY | • thoughtlessly adv. Done without thinking. • THOUGHTLESS adv. insufficiently alert. |
| YOUTHHEADS | • YOUTHHEAD n. (obsolete) youth, also YOUNGTH, YOUTHHOOD. |