Sperm Whale Definition

noun
Any of a family (Physeteridae) of toothed whales; esp., a large species (Physeter catodon) inhabiting warm seas: a closed cavity in its roughly square head contains sperm oil.
Webster's New World
Either of two small toothed whales (Kogia breviceps or K. sima) also containing spermaceti in the head.
American Heritage
Synonyms:
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Other Word Forms of Sperm Whale

Noun

Singular:
sperm whale
Plural:
sperm-whales

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