The Collaborative International Dictionary of English v.0.48:

Steam \Steam\ (st[=e]m), v. i. [imp. & p. p. Steamed
   (st[=e]md); p. pr. & vb. n. Steaming.]
   1. To emit steam or vapor.
      [1913 Webster]

            My brother's ghost hangs hovering there,
            O'er his warm blood, that steams into the air.
                                                  --Dryden.
      [1913 Webster]

            Let the crude humors dance
            In heated brass, steaming with fire intense. --J.
                                                  Philips.
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   2. To rise in vapor; to issue, or pass off, as vapor.
      [1913 Webster]

            The dissolved amber . . . steamed away into the air.
                                                  --Boyle.
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   3. To move or travel by the agency of steam.
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            The vessel steamed out of port.       --N. P.
                                                  Willis.
      [1913 Webster]

   4. To generate steam; as, the boiler steams well.
      [1913 Webster]

WordNet (r) 3.0 (2006):

steaming
    adv 1: (used of heat) extremely; "the casserole was piping hot"
           [syn: piping, steaming]
    adj 1: filled with steam or emitting moisture in the form of
           vapor or mist; "a steaming kettle"; "steamy towels" [syn:
           steaming, steamy]

Moby Thesaurus II by Grady Ward, 1.0:

110 Moby Thesaurus words for "steaming":
   ablaze, aeration, aerial, aerification, aerodynamic, aerostatic,
   aery, afire, airy, ardent, atomization, boating, boiling,
   boiling over, breathless, burning, burning with excitement,
   canoeing, circumnavigation, coasting, cordial, cruising, delirious,
   distillation, drunk, enthusiastic, ethereal, etherealization,
   etherification, evaporation, excited, exhalation, exuberant,
   febrile, fervent, fervid, fevered, feverish, fiery, flaming,
   fluidization, flushed, fractionation, fumigation, fuming, fumy,
   gaseous, gasification, gasified, gasiform, gaslike, gassy, glowing,
   gunkholing, hearty, heated, hectic, het up, hot, impassioned,
   in rut, intense, intoxicated, keen, lively, mephitic, miasmal,
   miasmatic, miasmic, motorboating, navigability, navigating,
   navigation, on fire, oxyacetylene, oxygenous, ozonic,
   passage-making, passionate, periplus, pneumatic, red-hot, reeking,
   reeky, rowing, sailing, sculling, sea travel, seafaring, seething,
   sexually excited, smoking, smoky, steamy, sublimation,
   travel by water, unrestrained, vaporing, vaporish, vaporization,
   vaporlike, vaporous, vapory, vigorous, volatilization, voyaging,
   warm, water travel, yachting, zealous