COCKROACH
cockroach, roach
(noun) any of numerous chiefly nocturnal insects; some are domestic pests
Source: WordNet® 3.1
Etymology
Noun
cockroach (plural cockroaches)
A black or brown straight-winged insect of the order Blattodea.
Synonym: roach (US)
(slang, offensive) A person or a member of a group of people regarded as undesirable and rapidly procreating.
(offensive, slang, ethnic slur, Rwanda) A Tutsi.
Source: Wiktionary
Cock"roach, n. Etym: [Sp. cucaracha.] (Zoöl.)
Definition: An orthopterus 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: Webster’s Unabridged Dictionary 1913 Edition