The Collaborative International Dictionary of English v.0.48:
Physeter \Phy*se"ter\ (f[imac]*s[=e]"t[~e]r), n. [L., fr. Gr. fyshth`r, fr. fysa^n to blow: cf. F. phys['e]t[`e]re.] [capitalized] 1. (Zool.) The genus that includes the sperm whale (Physeter macrocephalus). [1913 Webster] 2. A filtering machine operated by air pressure. [1913 Webster]WordNet (r) 3.0 (2006):
Physeter n 1: type genus of the Physeteridae [syn: Physeter, genus Physeter]