The Collaborative International Dictionary of English v.0.48:

Contuse \Con*tuse"\ (k[o^]n*t[=u]z"), v. t. [imp. & p. p.
   Contused (k[o^]n*t[=u]zd"); p. pr. & vb. n. Contusing.]
   [L. contusus, p. p. of contundere to beat, crush; con- +
   tundere to beat, akin to Skr. tud (for stud) to strike, Goth.
   stautan. See Stutter.]
   1. To beat, pound, or bray together.
      [1913 Webster]

            Roots, barks, and seeds contused together. --Bacon.
      [1913 Webster]

   2. To bruise; to injure or disorganize a part without
      breaking the skin.
      [1913 Webster]

   Contused wound, a wound attended with bruising.
      [1913 Webster] contused

WordNet (r) 3.0 (2006):

contuse
    v 1: injure the underlying soft tissue or bone of; "I bruised my
         knee" [syn: bruise, contuse]