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]
Farlex Partner Medical Dictionary © Farlex 2012

ambergris

a substance, used in the manufacture of perfume, found in the alimentary canal of sperm whales in the form of a grey waxy secretion.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005