Source : Webster's Revised Unabridged Dictionary (1913)

Cornu \Cor"nu\ (k[^o]r"n[-u]), n.; pl. {Cornua} (-n[-u]*[.a]).
   [L.]
   A horn, or anything shaped like or resembling a horn.

Source : WordNet®

cornua
     See {cornu}

cornu
     n : (anatomy) any structure that resembles a horn in shape
     [also: {cornua} (pl)]