a combining form meaning “ill,” “bad,” used in the formation of compound words: dysfunction.

< Greek; cognate with Old Norse tor-, German zer-, Sanskrit dus-

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World English Dictionary
1.  diseased, abnormal, or faulty: dysentery; dyslexia
2.  difficult or painful: dysuria
3.  unfavourable or bad: dyslogistic
[via Latin from Greek dus-]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

prefix meaning "bad, ill, abnormal," from Gk. dys- "bad, hard, unlucky," from PIE base *dus- "bad, ill, evil" (cf. Skt. dus-, O.Pers. du- "ill," O.H.G. zur-, Goth. tuz- "un-"), used as a prefix, a derivative of *deu- "to lack, be wanting" (cf. Gk. dein "to lack, want").
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

dys- pref.

  1. Abnormal: dysplasia.

  2. Impaired: dysesthesia.

  3. Difficult: dysphonia.

  4. Bad: dyspepsia.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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