noun Pathology.
a neurologic disorder marked by loss of the ability to understand written or printed language, usually resulting from a brain lesion or a congenital defect.
Also called word blindness.

1875–80; a-6 + Greek léx(is) speech (leg- stem of légein to speak + -sis -sis) + -ia; altered meaning by association of -lex- with lexicon, etc. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
alexia (əˈlɛksɪə)
Compare aphasia Nontechnical name: word blindness a disorder of the central nervous system characterized by impaired ability to read
[C19: from New Latin, from a-1 + Greek lexis speech; influenced in meaning by Latin legere to read]

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American Heritage
Medical Dictionary

alexia a·lex·i·a (ə-lěk'sē-ə)
Loss of the ability to comprehend the meaning of written or printed words and sentences, usually caused by brain lesions. Also called text blindness, visual aphasia, word blindness.

a·lex'ic adj.
The American Heritage® Stedman's Medical Dictionary
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