The Collaborative International Dictionary of English v.0.48:

Barbecue \Bar"be*cue\ (b[aum]"b[-e]*k[=u]), n. [In the language
   of the (Arawak or Taino) Indians of Guiana, barbacoa a frame
   on which all kinds of flesh and fish are roasted or
   smoke-dried.]
   1. a framework of metal or brick, usually with a grill on
      top, in which a fire is lighted and on which food is
      cooked, usually outdoors; -- also called a barbecue
      grill.
      [PJC]

   2. A social entertainment, where people assemble, usually in
      the open air, at which a meal is prepared on a barbecue
      grill.
      [1913 Webster +PJC]

   3. A floor, on which coffee beans are sun-dried.
      [1913 Webster]

   4. A hog, ox, or other large animal roasted or broiled whole
      for a feast.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Barbecue \Bar"be*cue\, v. t. [imp. & p. p. Barbecued; p. pr. &
   vb. n. Barbecuing.]
   1. To dry or cure by exposure on a frame or gridiron.
      [1913 Webster]

            They use little or no salt, but barbecue their game
            and fish in the smoke.                --Stedman.
      [1913 Webster]

   2. To roast or broil whole, as an ox or hog.
      [1913 Webster]

            Send me, gods, a whole hog barbecued. --Pope.
      [1913 Webster]

WordNet (r) 3.0 (2006):

barbecue
    n 1: meat that has been barbecued or grilled in a highly
         seasoned sauce [syn: barbecue, barbeque]
    2: a cookout in which food is cooked over an open fire;
       especially a whole animal carcass roasted on a spit [syn:
       barbecue, barbeque]
    3: a rack to hold meat for cooking over hot charcoal usually out
       of doors [syn: barbecue, barbeque]
    v 1: cook outdoors on a barbecue grill; "let's barbecue that
         meat"; "We cooked out in the forest" [syn: barbeque,
         barbecue, cook out]

Moby Thesaurus II by Grady Ward, 1.0:

87 Moby Thesaurus words for "barbecue":
   TV dinner, alfresco meal, aspic, bake, baste, blanch, boil,
   boiled meat, bouilli, braise, breakfast, brew, broil, brown,
   brunch, buffet supper, civet, clambake, coddle, coffee break, cook,
   cookout, curry, devil, diner, dinner, do, do to perfection,
   elevenses, fire, fish fry, flesh, forcemeat, fricassee, frizz,
   frizzle, fry, game, griddle, grill, hachis, hash, heat, high tea,
   hot luncheon, jerky, joint, jugged hare, lunch, luncheon, mash,
   meat, meat breakfast, menue viande, mince, oven-bake, pan,
   pan-broil, parboil, pemmican, petit dejeuner, picnic, poach,
   pot roast, prepare, prepare food, roast, sausage meat, saute,
   scallop, scrapple, sear, shirr, simmer, steam, stew, stir-fry,
   supper, tea, tea break, teatime, tiffin, toast, venison, viande,
   wiener roast, wienie roast