noun
a waxy substance found in the head cavities of sperm whales, used in making candles, cosmetics, and ointments
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Spermaceti is a waxy substance found in the head of the sperm whale.
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Have you heard of spermaceti? It's this weird stuff in whale heads.
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I have no idea what spermaceti is, sounds like some alien material.
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Her skin was as smooth as spermaceti, glowing in the sunlight.