Firefly \Fire"fly`\, n.; pl. {Fireflies}. (Zool.)
Any luminous winged insect, esp. luminous beetles of the
family {Lampyrid[ae]}.
[1913 Webster]
Note: The common American species belong to the genera
{Photinus} (especially {Photinus pyralis}) and
{Photuris}, in which both sexes are winged. The name is
also applied to luminous species of {Elaterid[ae]}. See
{Fire beetle}.
[1913 Webster +PJC]