Sperm-whale meaning

A very large toothed whale (Physeter macrocephalus syn. P. catodon) formerly hunted for the spermaceti in its massive head and the ambergris in its intestines.
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Either of two small toothed whales (Kogia breviceps or K. sima) also containing spermaceti in the head.
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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.
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A whale (Physeter macrocephalus), the largest of the toothed whales.
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