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The Collaborative International Dictionary of English v.0.48 (gcide)

Cockroach \Cock"roach\, n. [Sp. cucaracha.] (Zool.)
An orthopterous insect of the genus {Blatta}, and allied
genera.
[1913 Webster]

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}
({Blatta Germanica}, formerly {Ectobia Germanica}),
also called the {German cockroach}.
[1913 Webster PJC]