The Collaborative International Dictionary of English v.0.48:
White-hot \White"-hot`\, a. White with heat; heated to whiteness, or incandescence. [1913 Webster]WordNet (r) 3.0 (2006):
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, white-hot]