The Collaborative International Dictionary of English v.0.48:

paradox \par"a*dox\ (p[a^]r"[.a]*d[o^]ks), n.; pl. paradoxes
   (p[a^]r"[.a]*d[o^]ks*[e^]z). [F. paradoxe, L. paradoxum, fr.
   Gr. para`doxon; para` beside, beyond, contrary to + dokei^n
   to think, suppose, imagine. See Para-, and Dogma.]
   A tenet or proposition contrary to received opinion; an
   assertion or sentiment seemingly contradictory, or opposed to
   common sense; that which in appearance or terms is absurd,
   but yet may be true in fact.
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         A gloss there is to color that paradox, and make it
         appear in show not to be altogether unreasonable.
                                                  --Hooker.
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         This was sometime a paradox, but now the time gives it
         proof.                                   --Shak.
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   Hydrostatic paradox. See under Hydrostatic.
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