The Collaborative International Dictionary of English v.0.48:
Lutra \Lutra\ n. A genus which in some classifications considered a genus of the subfamily Lutrinae. Syn: genus Lutra. [WordNet 1.5]WordNet (r) 3.0 (2006):
Lutra n 1: in some classifications considered a genus of the subfamily Lutrinae [syn: Lutra, genus Lutra]