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]
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