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sperm whale
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
See sperm whale in American Heritage Dictionary 4
noun
Any of several large, toothed whales of the family Physeteridae, especially Physeter catodon or P. macrocephalus, of tropical and temperate oceans, whose massive head has a cavity containing sperm oil and spermaceti and whose long intestines often contain ambergris. Also called cachalot.
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