The Collaborative International Dictionary of English v.0.48:

Wry \Wry\, a. [Compar. Wrier; superl. Wriest.] [Akin to OE.
   wrien to twist, to bend, AS. wrigian to tend towards, to
   drive.]
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   1. Turned to one side; twisted; distorted; as, a wry mouth.
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   2. Hence, deviating from the right direction; misdirected;
      out of place; as, wry words.
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            Not according to the wry rigor of our neighbors, who
            never take up an old idea without some extravagance
            in its application.                   --Landor.
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   3. Wrested; perverted.
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            He . . . puts a wry sense upon Protestant writers.
                                                  --Atterbury.
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   Wry face, a distortion of the countenance indicating
      impatience, disgust, or discomfort; a grimace.
      [1913 Webster]

WordNet (r) 3.0 (2006):

wry face
    n 1: a disdainful grimace [syn: pout, moue, wry face]