The Collaborative International Dictionary of English v.0.48:
Cepphus \Cepphus\ n. a genus comprising the gillemots. Syn: genus Cepphus. [WordNet 1.5]WordNet (r) 3.0 (2006):
Cepphus n 1: a genus of birds including: guillemots [syn: Cepphus, genus Cepphus]