Search Result for "silverback": 
Wordnet 3.0

NOUN (1)

1. an adult male gorilla with grey hairs across the back;


The Collaborative International Dictionary of English v.0.48:

Silverback \Sil"ver*back`\, n. (Zool.) The knot. [1913 Webster]
WordNet (r) 3.0 (2006):

silverback n 1: an adult male gorilla with grey hairs across the back