guitarfish UK /ɡɪˈtɑː(ɹ)ˌfɪʃ/US /ɡɪˈtɑɹˌfɪʃ/ noun2 •Any of the family Rhinobatidae of rays with elongated bodies, flattened heads and trunks, and small, ray-like wings. •Any of the family Glaucostegidae of rays, formally classified under the family Rhinobatidae. formsguitarfishes