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meconin
From The Collaborative International Dictionary of English v.0.48:
Meconin \Mec"o*nin\, n. [Cf. F. m['e]conine.] (Chem.) A substance regarded as an anhydride of meconinic acid, existing in opium and extracted as a white crystalline substance. Also erroneously called meconina, meconia, etc., as though it were an alkaloid. [1913 Webster]
