one that uses wings.-the fly of a flag: see fly, n., 6.-anything that is scattered abroad in great numbers as a theatrical programme, an advertising leaf, etc.-one in a flight of steps which are parallel to each other(as in ordinary stairs), as distinguished from a winder.-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.-the fan wheel that rotates the cap of a windmill as the wind veers.-a small operation not involving ? considerable part of one's capital, or not in the line of one's ordinary business; a venture.