Hypertext Webster Gateway: "hyoscyamine"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Hyoscyamine \Hy`os*cy"a*mine\, n. [See {Hyoscyamus}.] (Chem.)
An alkaloid found in henbane ({Hyoscyamus niger}), and
regarded as its active principle. It is also found with other
alkaloids in the thorn apple and deadly nightshade. It is
extracted as a white crystalline substance, with a sharp,
offensive taste. Hyoscyamine is isomeric with atropine, is
very poisonous, and is used as a medicine for neuralgia, like
belladonna. Called also {hyoscyamia}, {duboisine}, etc.
From WordNet (r) 1.7 (wn)
hyoscyamine
n : a poisonous crystalline alkaloid (isometric with atropine
but more potent); used to treat excess motility of the
gastrointestinal tract
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