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From The Collaborative International Dictionary of English v.0.48:
Osmazome \Os"ma*zome\, n. [Gr. ? smell, odor + ? broth: cf. F. osmaz[^o]me.] (Old Chem.) A substance formerly supposed to give to soup and broth their characteristic odor, and probably consisting of one or several of the class of nitrogenous substances which are called extractives. [1913 Webster]