| urus | <zoology> A very large, powerful, and savage extinct bovine animal (Bos urus or primigenius) anciently abundant in Europe. It appears to have still existed in the time of Julius Caesar. It had very large horns, and was hardly capable of domestication. Called also, ur, ure, and tur. Origin: L.; of Teutonic origin. See Aurochs. Source: Websters Dictionary (01 Mar 1998) |
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| urushiol | A mixture of nonvolatile hydrocarbons, derivatives of catechol with unsaturated C15 or C17 side chains, constituting the active allergen of the irritant oil of poison ivy, Toxicodendron radicans, poison oak, T. Diversilobum, and the Asiatic laquer tree, T. Verniciferum. Origin: Jap. Urushi, lac, + L. Oleum, oil (05 Mar 2000) |
| urushiol oxidase | <enzyme> An enzyme oxidizing benzenediols to semiquinones with O2. Synonym: monophenol monooxygenase, phenol oxidase, phenolase, polyphenol oxidase, urushiol oxidase. (05 Mar 2000) |