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

Moby Thesaurus II by Grady Ward, 1.0:

52 Moby Thesaurus words for "salad":
   Caesar salad, Jell-O salad, Waldorf salad, all sorts, ambrosia,
   aspic, assemblage, assortment, brew, broad spectrum, chef salad,
   cole slaw, combination salad, conglomeration, crab Louis,
   fruit salad, gallimaufry, green salad, hash, herring salad,
   hodgepodge, hotchpot, hotchpotch, jumble, macaroni salad, magpie,
   mash, medley, melange, mess, mingle-mangle, miscellany, mishmash,
   mix, mixed bag, odds and ends, olio, olla podrida, omnium-gatherum,
   pasticcio, pastiche, patchwork, potato salad, potpourri, salade,
   salmagundi, sauce, scramble, slaw, stew, tossed salad,
   what you will