The Collaborative International Dictionary of English v.0.48:
Cockroach \Cock"roach\, n. [Sp. cucaracha.] (Zool.)
An orthopterous insect of the genus Blatta, and allied
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]