The Collaborative International Dictionary of English v.0.48:

Incandescent \In`can*des"cent\, a. [L. incandecens, -entis, p.
   pr. of incandescere to become warm or hot; pref. in- in +
   candescere to become of a glittering whiteness, to become red
   hot, incho. fr. candere to be of a glittering whiteness: cf.
   F. incandescent. See Candle.]
   White, glowing, or luminous, with intense heat; as,
   incandescent carbon or platinum; hence, clear; shining;
   brilliant.
   [1913 Webster]

         Holy Scripture become resplendent; or, as one might
         say, incandescent throughout.            --I. Taylor.
   [1913 Webster]

   Incandescent lamp, Incandescent light, Incandescent
   light bulb (Elec.), a kind of lamp in which the light is
      produced by a thin filament of conducting material, now
      usually tungsten, but originally carbon, contained in a
      vacuum or an atmosphere of inert gas within a glass bulb,
      and heated to incandescence by an electric current. It was
      inventerd by Thomas Edison, and was once called the
      Edison lamp; -- called also incandescence lamp, and
      glowlamp. This is one of the two most common sources of
      electric light, the other being the fluorescent light,
      fluorescent lamp or fluorescent bulb.
      [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

incandescent
    adj 1: emitting light as a result of being heated; "an
           incandescent bulb" [syn: incandescent, candent]
    2: characterized by ardent emotion or intensity or brilliance;
       "an incandescent performance"

Moby Thesaurus II by Grady Ward, 1.0:

82 Moby Thesaurus words for "incandescent":
   ablaze, afire, aflame, aflicker, aglow, alight, ardent, beaming,
   beamy, blazing, blushing, bright, bright and sunny, brilliant,
   burning, candent, candescent, comburent, conflagrant, effulgent,
   fiery, flagrant, flaming, flaring, flickering, flushing, fulgent,
   fuming, gleaming, gleamy, glinting, glowing, guttering, ignescent,
   ignited, illuminant, in a blaze, in a glow, in flames, inflamed,
   irradiative, kindled, lambent, lamping, light as day, live, living,
   lucent, luciferous, lucific, luciform, luminant, luminative,
   luminiferous, luminificent, luminous, lustrous, on fire, orient,
   radiant, red-hot, reeking, refulgent, rutilant, rutilous,
   scintillant, scintillating, shining, shiny, smoking, smoldering,
   sparking, starbright, starlike, starry, streaming, suffused, sunny,
   sunshiny, unextinguished, unquenched, white-hot