Source : Webster's Revised Unabridged Dictionary (1913)

Catnip \Cat"nip`\, Catmint \Cat"mint`\, n. (Bot.)
   A well-know plant of the genus {Nepeta} ({N. 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.

Source : WordNet®

catnip
     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}, {Nepeta cataria}]

Source : Free On-Line Dictionary of Computing

CATNIP
     
        {Common Architecture for Next Generation Internet Protocol}