The Collaborative International Dictionary of English v.0.48:

Salad \Sal"ad\ (s[a^]l"ad), n. [F. salade, OIt. salata, It.
   insalata, fr. salare to salt, fr. L. sal salt. See Salt,
   and cf. Slaw.]
   1. A preparation of vegetables, as lettuce, celery, water
      cress, onions, etc., usually dressed with salt, vinegar,
      oil, and spice, and eaten for giving a relish to other
      food; as, lettuce salad; tomato salad, etc.
      [1913 Webster]

            Leaves eaten raw are termed salad.    --I. Watts.
      [1913 Webster]

   2. A dish composed of chopped meat or fish, esp. chicken or
      lobster, mixed with lettuce or other vegetables, and
      seasoned with oil, vinegar, mustard, and other condiments;
      as, chicken salad; lobster salad.
      [1913 Webster]

   Salad burnet (Bot.), the common burnet (Poterium
      Sanguisorba), sometimes eaten as a salad in Italy.
      [1913 Webster]

WordNet (r) 3.0 (2006):

salad
    n 1: food mixtures either arranged on a plate or tossed and
         served with a moist dressing; usually consisting of or
         including greens