• synonyms


[hahy-uh-sahy-uh-meen, -min]
noun Pharmacology.
  1. a poisonous alkaloid, C17H23NO3, obtained from henbane and other solanaceous plants, used as a sedative, analgesic, mydriatic, and antispasmodic.
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Origin of hyoscyamine

First recorded in 1855–60; hyoscyam(us) + -ine2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for hyoscyamine

Historical Examples

  • Hyoscyamine is mainly identified by its power of dilating the pupil of the eye.

    Poisons: Their Effects and Detection

    Alexander Wynter Blyth

  • In 1832 Robiquet discovered codeine; and in 1833 atropine, aconitine, and hyoscyamine were distinguished by Geiger and Hesse.

  • Hyoscyamine gives no crystalline sublimate; it melts at 89°, and appears to volatilise in great part without decomposition.

  • According to a research by Ladenburg, hyoscyamine is associated with atropine, both in the Belladonna and Datura plants.

  • Hyoscyamine neutralises acids fully, and forms crystallisable salts, which assume for the most part the form of needles.

British Dictionary definitions for hyoscyamine


  1. a poisonous alkaloid occurring in henbane and related plants: an optically active isomer of atropine, used in medicine in a similar way. Formula: C 17 H 23 NO 3
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Word Origin

C19: from New Latin, from Greek huoskuamos (from hus pig + kuamos bean) + amine
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

hyoscyamine in Medicine


  1. A poisonous white crystalline alkaloid isometric with atropine and having similar uses but more potent effects.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.