The Collaborative International Dictionary of English v.0.48:

Grill \Grill\, v. t. [imp. & p. p. Grilled; p. pr. & vb. n.
   Grilling.] [F. griller, fr. gril gridiron, OF. gra["i]l, L.
   craticulum for craticula fine hurdlework, a small gridiron,
   dim. of crates hurdle. See Grate, n.]
   [1913 Webster]
   1. To broil on a grill or gridiron.
      [1913 Webster]

            Boiling of men in caldrons, grilling them on
            gridirons.                            --Marvell.

   2. To torment, as if by broiling. --Dickens.
      [1913 Webster]

   3. To stamp or mark with a grill.
      [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

grilling
    n 1: cooking by direct exposure to radiant heat (as over a fire
         or under a grill) [syn: broil, broiling, grilling]

Moby Thesaurus II by Grady Ward, 1.0:

69 Moby Thesaurus words for "grilling":
   ardent, baking, barbecuing, basting, blistering, boiling, braising,
   brewing, broil, broiling, burning, burning hot, canicular,
   catering, cookery, cooking, cross-examination, cross-interrogation,
   cross-questioning, cuisine, culinary science, direct examination,
   domestic science, ebullient, feverish, flushed, frying, heated,
   home economics, hot, hot as fire, hot as hell, inquisition,
   interrogation, like a furnace, like an oven, nutrition, overheated,
   overwarm, pan-broiling, parching, piping hot, poaching,
   police interrogation, red-hot, redirect examination, roasting,
   sauteing, scalding, scorching, searing, seething, shirring,
   simmering, sizzling hot, smoking hot, steeping, stewing, sudorific,
   sweating, sweaty, sweltering, sweltry, the grill, third degree,
   third-degree, toasting, torrid, white-hot