| HYDROGRAPHY | • hydrography n. (Nautical) The scientific measurement and description of the physical features and conditions of navigable… • HYDROGRAPHY n. the study of bodies of water. |
| HYDROPHYTES | • hydrophytes n. Plural of hydrophyte. • HYDROPHYTE n. an aquatic plant; an alga. |
| HYDROPHYTIC | • hydrophytic adj. Relating to hydrophytes. • HYDROPHYTIC adj. growing in or by water, also HYDROPHYTOUS. |
| HYDROPHYTON | • hydrophyton n. (Biology) A branched structure that supports the zooids in colonial hydrozoa. • HYDROPHYTON n. the coenosarc of a hydroid colony. |
| HYDROPOLYPS | • hydropolyps n. Plural of hydropolyp. • HYDROPOLYP n. a hydrozoan polyp. |
| HYPERDACTYL | • HYPERDACTYL adj. having more than five fingers or toes. |
| HYPERLYDIAN | • HYPERLYDIAN adj. in Greek music, above the Lydian mode. |
| HYPERPLOIDY | • hyperploidy n. The condition of being hyperploid. • HYPERPLOIDY n. the state of being hyperploid, in excess of but not exact multiple of diploid. |
| HYPOTHYROID | • hypothyroid adj. Of or pertaining to hypothyroidism. • hypothyroid adj. Having hypothyroidism. • HYPOTHYROID adj. affected with hypothyroidism. |
| POLYHYBRIDS | • polyhybrids n. Plural of polyhybrid. • POLYHYBRID n. a plant hybridised from many sources. |
| POLYHYDROXY | • polyhydroxy adj. (Organic chemistry) Having three or more hydroxy functional groups. • POLYHYDROXY adj. containing more than one hydroxyl group in the molecule. |
| PYRAMIDALLY | • pyramidally adv. Like a pyramid; in a pyramidal manner or shape. • PYRAMIDAL adv. shaped like a pyramid. |
| SULPHHYDRYL | • sulphhydryl n. Alternative spelling of sulfhydryl. • SULPHHYDRYL n. a chemical group, SH, characteristic of sulphur-containing compounds, also SULFHYDRYL. |
| TYPEFOUNDRY | • type␣foundry n. A company that designs and/or distributes typefaces. • TYPEFOUNDRY n. a place where type is cast. |
| TYROGLYPHID | • TYROGLYPHID n. a mite of the genus Tyroglyphus, including the cheesemite and the flour-mite. |