fid·dler \ˈfid(ə)lə(r)\noun (-s) Etymology: Middle English fitheler, fideler, from Old English fithelere, from fithele fiddle + -ere -er — more at fiddle 1. a.: one that fiddles b.: violinist 2. a.alsofiddlerfish\ˈ ̷ ̷( ̷ ̷) ̷ ̷ˌ ̷ ̷\: any of several rays of the family Rhinobatidae that resemble a violin in outline — called also fiddlefish, fiddle shark b.alsofiddler catorfiddler catfish: spotted cat