aloin

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al·o·in

(al'ō-in),
A yellow crystalline principle composed of aloe-emodin and glucose, obtained from aloe; used as a laxative.
Synonym(s): aloetin, barbaloin
Farlex Partner Medical Dictionary © Farlex 2012

aloin

(ăl′ō-ĭn)
n.
A bitter yellow crystalline compound obtained from certain aloes and having laxative properties. Its use in laxatives was banned in the United States in 2002.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.