Merriam-Webster Collegiate Dictionary - glow

 I. intransitive verb  Etymology: Middle English, from Old English glowan; akin to Old English geolu yellow — more at yellow  Date: before 12th century  1.  a. to shine with or as if with an intense heat embers ~ing in the darkness  b.  (1) to have a rich warm typically ruddy color cheeks ~ing with health  (2) flush, blush the children ~ed with excitement  2.  a. to experience a sensation of or as if of heat ~ing with rage  b. to show exuberance or elation ~ with pride  • ~ingly adverb  II. noun  Date: 1600  1. brightness or warmth of color; especially redness  2.  a. warmth of feeling or emotion  b. a sensation of warmth the drug produces a sustained ~  3.  a. the state of ~ing with heat and light  b. light such as is emitted by a solid body heated to luminosity ; incandescence