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

 

cockchafer

 noun
noun
BrE BrE//ˈkɒktʃeɪfə(r)//
 
; NAmE NAmE//ˈkɑːktʃeɪfər//
 
(also May bug) Invertebrates
 
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a large brown insect that flies and makes a loud noise in early evening in summer See related entries: Invertebrates Word Origin early 18th cent.: from cock (expressing size or vigour) + chafer.