| is- | 1. <prefix> A prefix or combining form, indicating identity, or equality; the same numerical value; as in isopod, isomorphous, isochromatic. Specif. 2. <chemistry> Applied to compounds of certain isomeric series in whose structure one carbon atom, at least, is connected with three other carbon atoms; contrasted with neo- and normal; as in isoparaffine; isopentane. Origin: Gr. 'isos equal. (29 Oct 1998) |
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