any of various narrow-billed, northern alcidine shorebirds (genera Uria and Cepphus)
Origin of guillemotFrench diminutive of Guillaume, William: see robin
- Any of several auks of the genus Cepphus of the northern Atlantic and Pacific Oceans, having black plumage with white markings.
- Chiefly British See murre.
Origin of guillemotFrench, diminutive of the personal name Guillaume.
Not to be confused with guillemet.