or di·eth·yl·stil·boes·trol

[dahy-eth-uh l-stil-bes-trawl, -trol]
noun Pharmacology.
  1. a nonsteroidal synthetic estrogen, C18H20O2, used in medicine chiefly in the treatment of menopausal symptoms and in animal feeds for chemical caponization: formerly used during pregnancy for the prevention of miscarriage but discontinued owing to its association with an increased risk of vaginal and cervical cancers in women having had fetal exposure. Abbreviation: DES
Also stil·bes·trol, stil·boes·trol [stil-bes-trawl] /stɪlˈbɛs trɔl/.

Origin of diethylstilbestrol

1935–40; di-1 + ethyl + stilbestrol; see stilbene, estrus, -ol1 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for diethylstilbestrol



  1. a synthetic hormone with oestrogenic properties, used to relieve menopausal symptoms. Formula: OHC 6 H 4 CH:CHC 6 H 4 OHAlso called: stilbestrol, stilboestrol
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

diethylstilbestrol in Medicine


[dī-ĕth′əl-stĭl-bēstrôl, -trōl]
  1. DES.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

diethylstilbestrol in Science


[dī-ĕth′əl-stĭl-bĕstrôl′, -trōl′]
  1. See DES.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.