Pronunciation: (gil'u-mot"), [key]
1. a black or brown-speckled seabird of the genus Cepphus, of northern seas, having a sharply pointed black bill, red legs, and white wing patches, as C. grylle (black guillemot), of the North Atlantic and the similar C. columba (pigeon guillemot) of the North Pacific.
2. Brit.a murre of the genus Uria.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.