Dys- vs a-: In general the prefix dys is used to indicate an impairment in a being able to accomplish a task or process while the prefix a- indicates complete inability to perform the process or complete absence of the item. For example, dyscalculia would refer to a learning disability in some aspect of math while acalculia would refer to complete absence of math skills usually acquired as a result of braininjury
Answered 11/30/2014
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