Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of firefly is as below...

Fly :: Fly (v. i.) Any winged insect; esp., one with transparent wings; as, the Spanish fly; firefly; gall fly; dragon fly..

Fire Beetle :: Fire beetle () A very brilliantly luminous beetle (Pyrophorus noctilucus), one of the elaters, found in Central and South America; -- called also cucujo. The name is also applied to other species. See Firefly..

Firefly :: Firefly (n.) Any luminous winged insect, esp. luminous beetles of the family Lampyridae..

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