ambergris
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am·ber·gris
(am'bĕr-gris), The s in this word is not silent.A grayish pathologic secretion from the intestine of the sperm whale that occurs as a flammable waxy mass (melting point about 60°C), insoluble in water; contains cholesterol and benzoic acid; used as a base for perfume.
[Mod. L. ambra grisea, gray amber]