Fly \Fly\, n.; pl. Flies (fl[imac]z). [OE. flie, flege, AS. fl[=y]ge, fle['o]ge, fr. fle['o]gan to fly; akin to D. vlieg, OHG. flioga, G. fliege, Icel. & Sw. fluga, Dan. flue. [root] 84. See Fly, v. i.]

1. (Zo["o]l.)
   (a) Any winged insect; esp., one with transparent wings; as, the Spanish fly; firefly; gall fly; dragon fly.
   (b) Any dipterous insect; as, the house fly; flesh fly; black fly. See Diptera, and Illust. in Append.

2. A hook dressed in imitation of a fly, -- used for fishing. ``The fur-wrought fly.'' --Gay.

Source: Webster's Revised Unabridged Dictionary (1913)