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prosopagnosia

noun
  1. an inability to recognize faces
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Word Origin

C20: from Greek prosōpon face + agnosia
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

Word Origin and History for prosopagnosia

n.

1950, Medical Latin from German prosopagnosie (1948), from Greek prosopon "face" (see prosopopeia) + agnosia "ignorance" (see agnostic).

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Online Etymology Dictionary, © 2010 Douglas Harper

prosopagnosia in Medicine

prosopagnosia

(prŏs′ə-păg-nōzhə, -zē-ə)
n.
  1. An inability or difficulty in recognizing familiar faces; it may be congenital or result from injury or disease of the brain.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.