Cat·nip Cat·mint n. Bot. A well-know plant of the genus Nepeta (Nepeta Cataria), somewhat like mint, having a string scent, and sometimes used in medicine. It is so called because cats have a peculiar fondness for it.
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  Nepeta cataria
       n : hairy aromatic perennial herb having whorls of small white
           purple-spotted flowers in a terminal spike; used in the
           past as a domestic remedy; strongly attractive to cats
           [syn: catmint, catnip]