Source : Webster's Revised Unabridged Dictionary (1913)

White-hot \White"-hot`\, a.
   White with heat; heated to whiteness, or incandescence.

Source : WordNet®

white-hot
     adj 1: intensely zealous or fervid; "fierce white-hot loyalty"
     2: glowing white with heat; "white flames"; "a white-hot center
        of the fire" [syn: {white}]