Fid"dler (?), n. [AS. fiðelere.] 1. One who plays on a fiddle or violin.

2. (Zoöl.) 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 calling crab, soldier crab, and fighting crab.

3. (Zoöl.) The common European sandpiper (Tringoides hypoleucus); -- so called because it continually oscillates its body.

• (music) One who plays the fiddle.