Webster's English Dictionary

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ambergris

am.ber.gris \-.gris, -.gre-s\ n [ME ambregris, fr. MF ambre gris, fr. ambre 
   + gris gray] - more at GRIZZLE : a waxy substance found floating in or on 
   the shores of tropical waters,  believed to originate in the intestines of 
   the sperm whale, and used in perfumery as a fixative