- See under guillemot(def 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.
- British. a murre of the genus Uria.
Origin of guillemot
1670–80; < French, apparently diminutive of Guillaume William
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- any northern oceanic diving bird of the genera Uria and Cepphus, having a black-and-white plumage and long narrow bill: family Alcidae (auks, etc), order Charadriiformes
C17: from French, diminutive of Guillaume William