Meaning of bucranium

bu•cra•ni•um

Pronunciation: (by-krā'nē-um), [key]
— pl. -ni•a
  1. (in classical architecture) an ornament, esp. on a frieze, having the form of the skull of an ox.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.