The Collaborative International Dictionary of English v.0.48:

Crow's-foot \Crow's"-foot`\ (kr?z"f??t`), n.; pl. Crow's-feet
   (-f[=e]t`).
   [1913 Webster]
   1. pl. The wrinkles that appear, as the effect of age or
      dissipation, under and around the outer corners of the
      eyes. --Tennyson.
      [1913 Webster]

   2. (Mil.) A caltrop. [Written also crowfoot.]
      [1913 Webster]

   3. (Arch.) Same as Bird's-mouth. [U.S.]
      [1913 Webster]