am·ber·gris 
(ămbər-grĭs′, -grēs′)
(ămbər-grĭs′, -grēs′)n.
A waxy grayish substance from the intestines of sperm whales that was used as a fixative and a fragrance in the manufacture of perfumes. It is found floating at sea or washed ashore and was formerly extracted from whale carcasses.
[Middle English, from Old French ambre gris : ambre, amber; see AMBER + gris, gray; see GRISAILLE.]