A small star which gives out white light, owing to its intense heat. Stars of this kind are immensely heavy for their size. A certain one of them, though no larger than the Earth, is believed to weigh nearly 50,000 times as much as the Earth. In such a star terrific heat and pressure is thought to break down the nature of the atom, so that its parts, instead of reserving to themselves a space vastly greater than their own bulk, are crowded closely together. The heat at the center of a White Dwarf may be anything up to fifty times that at the center of the Sun.
White Dwarf (Wikipedia)