A commenter's remark on the recent post "Dysfluency considered harmful":
I've always understood the 'dys-' prefix to be in contrast to an 'a-' prefix, where 'dys-' means something like 'born without' and 'a-' means 'loss of.' My favorite example of the contrast is 'dyslexia' vs. 'alexia', with the first meaning inherent problems with reading and the second meaning loss of the ability to read. Same with 'dysphasia'/'aphasia' and 'acalculia'/'dyscalculia.'
This is a good example of mistaken linguistic generalization from limited evidence. In fact the dys- prefix is usually said to be in contrast to the eu- prefix, not the a- prefix, though this is mostly an etymological idea rather than a fact of usage. In any case, dys- doesn't typically refer to inborn problems, but simply to abnormal, difficult, impaired, or bad characteristics.
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