The Collaborative International Dictionary of English v.0.48:
Physeteridae \Physeteridae\ prop. n. A natural family of marine mammals that includes the sperm whales. Syn: family Physeteridae. [WordNet 1.5]WordNet (r) 3.0 (2006):
Physeteridae n 1: sperm whales [syn: Physeteridae, family Physeteridae]