Dictionary![]() ![]() hy•os•cy•a•minePronunciation: (hī"u-sī'u-mēn", -min), [key] —n. Pharm. a poisonous alkaloid, C17H23NO3, obtained from henbane and other solanaceous plants, used as a sedative, analgesic, mydriatic, and antispasmodic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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