Source : Webster's Revised Unabridged Dictionary (1913)

Urohyal \U`ro*hy"al\, a. [2d uro- + the Gr. letter [Upsilon].]
   (Anat.)
   Of or pertaining to one or more median and posterior elements
   in the hyoidean arch of fishes. -- n. A urohyal bone or
   cartilage.