Dys- Definition
 dis 
    prefix
  
 Abnormal.
 Dysplasia.
 American Heritage 
Impaired.
 Dysgraphia.
 American Heritage 
Difficult.
 Dysphonia.
 American Heritage 
Wiktionary 
    affix
  
 Bad, ill, abnormal, impaired, difficult, etc.
 Dysfunction.
 Webster's New World 
Origin of Dys-
- Gr, bad, hard, unlucky < IE base *dus-, bad, ill > Goth tuz-, OHG zur- (Ger zer-), Sans duṣ- - From Webster's New World College Dictionary, 5th Edition 
-  Latin dys- bad from Greek dus- dus- in Indo-European roots From American Heritage Dictionary of the English Language, 5th Edition 
- From New Latin, from Ancient Greek δυσ- (dus-, “hard, difficult, bad”). - From Wiktionary 
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