firefly > define
noun
- Tropical American click beetle having bright luminous spots.
- synonyms: fire beetle, Pyrophorus noctiluca
- Nocturnal beetle common in warm regions having luminescent abdominal organs.
- synonyms: lightning bug
by WordNet 3.0 © 2006 by Princeton University
(n.) Any luminous winged insect, especially luminous beetles of the family Lampyridae.
by Webster's Revised Unabridged Dictionary