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eonism

[ee-uh-niz-uh m]
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noun Psychiatry.
  1. the adoption of feminine mannerisms, clothing, etc., by a male.
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Origin of eonism

1925–30; after the Chevalier d'Éon (died 1810), Frenchman who posed as a woman
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for eonism

eonism

noun
  1. psychiatry the adoption of female dress and behaviour by a maleSee also transvestite
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Word Origin

C19: named after Charles Éon de Beaumont (died 1810), French transvestite
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