The Collaborative International Dictionary of English v.0.48:

Backhand \Back"hand`\, n. [Back, adv. + hand.]
   1. A kind of handwriting in which the downward slope of the
      letters is from left to right.
      [1913 Webster]

   2. (Sports) The stroke of a ball with a racket or paddle, in
      which head of the racket starts from the side of the body
      opposite to that of the arm in which the racket is held,
      and proceeds forward to meet the ball. Contrasted with
      forehand.
      [PJC]

The Collaborative International Dictionary of English v.0.48:

Backhand \Back"hand`\, a.
   1. Sloping from left to right; -- said of handwriting.
      [1913 Webster]

   2. Backhanded; indirect; oblique. [R.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

backhand
    adj 1: (of racket strokes) made across the body with back of
           hand facing direction of stroke [syn: backhand(a),
           backhanded] [ant: forehand(a), forehanded]
    2: (of handwriting) having the letters slanting backward [syn:
       backhand, left-slanting]
    n 1: a return made with the back of the hand facing the
         direction of the stroke [syn: backhand, backhand
         stroke, backhand shot]
    v 1: hit a tennis ball backhand