| hydrase | Former name for hydratase. (05 Mar 2000) |
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| hydrastine | <chemistry> An alkaloid, found in the rootstock of the golden seal (Hydrastis Canadensis), and extracted as a bitter, white, crystalline substance. It is used as a tonic and febrifuge. Source: Websters Dictionary (01 Mar 1998) |
| hydrastinine | A semisynthetic alkaloid prepared from hydrastine; the hydrochloride has been used in uterine haemorrhage and as an oxytocic; in large doses, it is a powerful depressant of the entire motor tract (motor cortex, nerve, and muscle). (05 Mar 2000) |
| hydrastis | The dried rhizome of Hydrastis canadensis (family Ranunculaceae), a native of the eastern U.S.; formerly used in the treatment of chronic catarrhal states of the mucous membranes and in metrorrhagia. Synonym: golden seal, jaundice root, yellow root. Origin: Mod. L. Fr. G. Hydor (hydro-), water, + drao, to accomplish (05 Mar 2000) |