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From The Collaborative International Dictionary of English v.0.48:
opianine \o"pi*a*nine\, n. (Chem.) An alkaloid (C22H23NO7) found in small quantity in opium. It is identical with narcotine. It is present in amounts up to 11% in Papaver somniferum, and is used clinically as an antitussive. --MI11 Syn: noscapine; narcosine; opian. [1913 Webster +PJC]