Source : Webster's Revised Unabridged Dictionary (1913)

Cockroach \Cock"roach\, n. [Sp. cucaracha.] (Zo["o]l.)
   An orthopterous insect of the genus {Blatta}, and allied
   genera.

   Note: The species are numerous, especially in hot countries.
         Those most commonly infesting houses in Europe and
         North America are {Blatta orientalis}, a large species
         often called {black beetle}, and the Croton bug
         ({Ectobia Germanica}).

Source : WordNet®

cockroach
     n : any of numerous chiefly nocturnal insects; some are domestic
         pests [syn: {roach}]