cockroach Meaning, Definition & Usage

  1. noun any of numerous chiefly nocturnal insects; some are domestic pests
    roach.

WordNet

Cock"roach noun
Etymology
Sp. cucaracha.
Definitions
  1. (Zoöl.) An orthopterus insect of the genus Blatta, and allied genera. ✍ 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).

Webster 1913