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From The Collaborative International Dictionary of English v.0.48:
Opopanax \O*pop"a*nax\, n. [L., fr. Gr. ?; ? vegetable juice + pa`nax, pa`nakes, a kind of plant: cf. F. opopanax.] The inspissated juice of an umbelliferous plant (the Opoponax Chironum), brought from Turkey and the East Indies in loose granules, or sometimes in larger masses, of a reddish yellow color, with specks of white. It has a strong smell and acrid taste, and was formerly used in medicine as an emmenagogue and antispasmodic. --Dunglison. [1913 Webster]