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

 

firefly

 noun
noun
BrE BrE//ˈfaɪəflaɪ//
 
; NAmE NAmE//ˈfaɪərflaɪ//
 
(pl. fireflies)(North American English also lightning bug) Invertebrates
 
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a flying insect with a tail that shines in the dark See related entries: Invertebrates
See the Oxford Advanced American Dictionary entry: firefly