| hydrazones | Compounds of the general formula r:n.nr2, as resulting from the action of hydrazines with aldehydes or ketones. (12 Dec 1998) |
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| hydrencephalocele | Protrusion, through a cleft in the skull, of brain substance expanded into a sac containing fluid. Synonym: encephalocystocele, hydrocephalocele, hydroencephalocele. Origin: hydr-+ G. Enkephalos, brain, + kele, tumour (05 Mar 2000) |
| hydrencephalomeningocele | Protrusion, through a defect in the skull, of a sac containing meninges, brain substance, and cerebrospinal fluid. (05 Mar 2000) |
| hydrencephalus | Rarely used term for internal hydrocephalus. Origin: hydr-+ G. Enkephalos, brain (05 Mar 2000) |
| hydrencephsloid | <medicine> Same as Hydrocephaloid. Origin: Hydrencephalus. Source: Websters Dictionary (01 Mar 1998) |
| hydriad | A water nymph. Origin: Gr, of the water, fr. "ydwr water. Source: Websters Dictionary (01 Mar 1998) |
| hydriatric | Hydriatic Relating to the obsolete use of water to treat or cure disease. Synonym: hydrotherapeutic. Origin: hydr-+ G. Iatrikos, relating to medicine (05 Mar 2000) |
| 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) |