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From The Collaborative International Dictionary of English v.0.48:
Guillemot \Guil"le*mot`\, n. [F.] (Zool.) One of several northern sea birds, allied to the auks. They have short legs, placed far back, and are expert divers and swimmers. [1913 Webster] Note: The common guillemots, or murres, belong to the genus Uria (as U. troile); the black or foolish guillemot (Cepphus grylle, formerly Uria grylle), is called also sea pigeon and eligny. See Murre. [1913 Webster]