| hydric | Characterised by an abundant supply of water. (09 Oct 1997) |
|---|---|
| hydric soil | A soil that is saturated, flooded or ponded long enough during the growing season to develop anaerobic conditions in the upper part. (09 Oct 1997) |
| hydride | <chemistry> A compound of the binary type, in which hydrogen is united with some other element. Origin: Hydr- + ide. Source: Websters Dictionary (01 Mar 1998) |
| hydride ion | The H- i., transferred to acceptor molecules in some biological oxidations. (05 Mar 2000) |
| hydriform | <zoology> Having the form or structure of a hydra. Origin: Hydra. Source: Websters Dictionary (01 Mar 1998) |
| hydrina | <zoology> The group of hydroids to which the fresh water hydras belong. Origin: NL. See Hydra. Source: Websters Dictionary (01 Mar 1998) |
| hydrindantin | The reduced form of ninhydrin. (05 Mar 2000) |
| hydriodate | <zoology> Same as Hydriodide. Origin: Cf. F. Hydriodate. Source: Websters Dictionary (01 Mar 1998) |
| hydriodic | <chemistry> Pertaining to, or derived from, hydrogen and iodine; said of an acid produced by the combination of these elements. <chemistry> Hydriodic acid, a pungent, colourless gas, HI, usually prepared as a solution in water. It is strong reducing agent. Synonym: hydrogen iodine. Origin: Hydr- + iodic: cf. F. Hydriodique. Source: Websters Dictionary (01 Mar 1998) |
| hydriodide | <chemistry> A compound of hydriodic acid with a base; distinguished from an iodide, in which only the iodine combines with the base. Source: Websters Dictionary (01 Mar 1998) |
| hydro- | Hydr- 1. Water, watery. 2. Containing or combined with hydrogen. 3. A hydatid. Origin: G. Hydor, water (05 Mar 2000) |
| hydro-electric | Pertaining to, employed in, or produced by, the evolution of electricity by means of a battery in which water or steam is used. <physics> Hydro-electric machine, an apparatus invented by Sir William Armstrong of England for generating electricity by the escape of high-pressure steam from a series of jets connected with a strong boiler, in which the steam is produced. Origin: Hydro-, 1 + electric. Source: Websters Dictionary (01 Mar 1998) |
| hydro-lyases | <enzyme> Enzymes that catalyze the removal of water from a substrate by breakage of a carbon-oxygen bond, leading to formation of a double bond. The recommended name is usually dehydratase. The term synthase or hydratase is used when the reverse aspect of the reaction is dominant. Registry number: EC 4.2.1. (12 Dec 1998) |
| hydro-mulching | <botany> Seeding of grasses, mixed with fertiliser, a wood pulp mulch, and a tackifier to stick the mix to the ground, applied by a machine blower in a wet condition to exposed, denuded slopes or embankments. (if no mulch is used, it is called hydro-seeding.) (09 Oct 1997) |
| hydroa | Any bullous eruption. Synonym: hidroa. Origin: hydro + G. Oon, egg (05 Mar 2000) |