plural noun
Phys·​e·​ter·​i·​dae | \ˌfisəˈterəˌdē\

Definition of Physeteridae 

: a family of whales that includes the sperm whales, pygmy sperm whale, various related extinct forms, and formerly also the beaked whales — compare physeteroidea

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History and Etymology for Physeteridae

New Latin, from Physeter, type genus + -idae

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a nest or breeding place

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