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anhedonia

[an-hee-doh-nee-uh]
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noun Psychology.
  1. lack of pleasure or of the capacity to experience it.
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Origin of anhedonia

1895–1900; < Greek an- an-1 + hēdon(ḗ) pleasure + -ia -ia
Related formsan·he·don·ic [an-hee-don-ik] /ˌæn hiˈdɒn ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for anhedonia

n.

"inability to feel pleasure," 1897, from French anhédonie, coined 1896 by French psychologist Theodule Ribot (1839-1916) as an opposite to analgesia, from Greek an-, privative prefix (see an- (1)), + hedone "pleasure" (see hedonist).

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Online Etymology Dictionary, © 2010 Douglas Harper
anhedonia in Medicine

anhedonia

(ăn′hē-dō′nē-ə)
n.
  1. Absence of pleasure from the performance of acts that would normally be pleasurable.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.