Source : Webster's Revised Unabridged Dictionary (1913)

Chinch \Chinch\, n. [Cf. Sp. chinche, fr. L. {cimex}.]
   1. (Zo["o]l.) The bedbug ({Cimex lectularius}).

   2. (Zo["o]l.) A bug ({Blissus leucopterus}), which, in the
      United States, is very destructive to grass, wheat, and
      other grains; -- also called {chiniz}, {chinch bug},
      {chink bug}. It resembles the bedbug in its disgusting
      odor.

Source : WordNet®

chinch
     n : bug of temperate regions that infests especially beds and
         feeds on human blood [syn: {bedbug}, {bed bug}, {Cimex
         lectularius}]