*fiddler*

n. [ AS. fiðelere. ] 1. One who plays on a fiddle or violin. [ 1913 Webster ]

2. (Zool.) A burrowing crab of the genus Gelasimus, of many species. The male has one claw very much enlarged, and often holds it in a position similar to that in which a musician holds a fiddle, hence the name; -- called also fiddler crab, calling crab, soldier crab, and fighting crab. [ 1913 Webster ]

3. (Zool.) The common European sandpiper (Tringoides hypoleucus); -- so called because it continually oscillates its body. [ 1913 Webster ]

Fiddler crab. (Zool.) See Fiddler, n., 2. [ 1913 Webster ]