dys·lex·i·a

[dis-lek-see-uh]
noun Pathology.
any of various reading disorders associated with impairment of the ability to interpret spatial relationships or to integrate auditory and visual information.

Origin:
1885–90; < Neo-Latin < Greek dys- dys- + léx(is) word + -ia -ia

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
dyslexia (dɪsˈlɛksɪə) [Click for IPA pronunciation guide]
 
n
Nontechnical name: word blindness a developmental disorder which can cause learning difficulty in one or more of the areas of reading, writing, and numeracy
 
[from dys- + -lexia from Greek lexis word]
 
usage  Rather than talking about a person being dyslexic or about dyslexics, it is better to talk about a person with dyslexia, people with dyslexia
 
dyslectic
 
adj, —n
 
dys'lexic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Dyslexia is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a fool or simpleton; ninny.
Etymonline
Word Origin & History

dyslexia
c.1887, from Ger. dyslex, from Gk. dys- "bad, abnormal, difficult" (see dys-) + lexis "word," from legein "speak" (see lecture). Dyslexic (n.) is first recorded 1961; dyslectic (adj.) from 1964.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

dyslexia dys·lex·i·a (dĭs-lěk'sē-ə)
n.
A learning disorder marked by impairment of the ability to recognize and comprehend written words.


dys·lec'tic (-lěk'tĭk) n.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
dyslexia   (dĭs-lěk'sē-ə)  Pronunciation Key 
A learning disability marked by impairment of the ability to recognize and comprehend written words.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
dyslexia [(dis-lek-see-uh)]

Difficulty in reading when experienced by persons with normal vision and normal or above-normal intelligence. A common example of dyslexia is reading words with the letters in reverse order, as in fyl for fly.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
The fact that there is a text-to-speech function would be a great help for
  visually impaired readers, or those with dyslexia.
Dyslexia is usually interpreted broadly to include equations.
Dyslexia dysfunctions may explain some of the penchant for delay.
His problem was dyslexia-for a long time undiagnosed.
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