Dictionary![]() ![]() hy•os•cy•a•musPronunciation: (hī"u-sī'u-mus), [key] —n. the dried leaves, with or without the tops, of the henbane, Hyoscyamus niger, containing the alkaloids hyoscyamine and scopolamine, used in medicine. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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