\Fly"er\, n. [See {Flier}.]
1. One that uses wings.
2. The fly of a flag: See {Fly}, n., 6.
3. Anything that is scattered abroad in great numbers as a
   theatrical programme, an advertising leaf, etc.
4. (Arch.) One in a flight of steps which are parallel to
   each other(as in ordinary stairs), as distinguished from a
   winder.
5. The pair of arms attached to the spindle of a spinning
   frame, over which the thread passes to the bobbin; -- so
   called from their swift revolution. See {Fly}, n., 11.
6. The fan wheel that rotates the cap of a windmill as the
   wind veers. --Internat. Cyc.
7. (Stock Jobbing) A small operation not involving ?
   considerable part of one's capital, or not in the line of
   one's ordinary business; a venture. [Cant] --Bartlett.