Webster's English Dictionary

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vermin

ver.min \'v*r-m*n\ n or vermin [ME, fr. MF, fr. L vermis worm - more at 
   WORM] pl  1: noxious, mischievous, or disgusting animals of small size, of 
   common occ urrence, and difficult to control; also : birds and mammals that 
   prey upon game 2: a noxious or offensive person