[sahy-tos-tuh-rawl, -rol]
noun Chemistry.
any of five steroid alcohols having the formula C 2 2 H 5 0 O, especially the beta form, obtained from various plant sources: used in organic synthesis.

1915–20; sito- + sterol Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sitosterol (saɪˈtɒstəˌrɒl)
a white powder or waxy white solid extracted from soya beans, consisting of a mixture of isomers of the formula C29H50O with other sterols: used in cosmetics and medicine
[C20: from Greek sitos food, grain + sterol]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

sitosterol si·tos·ter·ol (sī-tŏs'tə-rôl', -rōl', sĭ-)
Any of a group of sterols that occur in high concentrations in certain plants, such as yams, and are used in the synthesis of steroid hormones.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Beta-sitosterol is a plant sterol found in some of these herbs that is marketed as a dietary supplement for prostate health.
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