Definition of cockroach noun from the Oxford Advanced Learner's Dictionary

 

cockroach

 noun
noun
BrE BrE//ˈkɒkrəʊtʃ//
 
; NAmE NAmE//ˈkɑːkroʊtʃ//
 
(also North American English, informal roach) Invertebrates
 
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a large brown insect with wings, that lives in houses, especially where there is dirt The kitchens were discovered to be infested with cockroaches. See related entries: Invertebrates Word Origin early 17th cent. (as cacaroch): from Spanish cucaracha. The spelling change was due to association with cock and roach.
See the Oxford Advanced American Dictionary entry: cockroach