Bioluminescent critters do it the dark

verb

1. To shine with or as if with an intense heat

   "embers glowing in the darkness"

2. To experience a sensation of or as if of heat

   "glowing with rage"

3. To show exuberance or elation

   "glow with pride"

noun

1. Brightness or warmth of color
2. Warmth of feeling or emotion
3. A sensation of warmth

   "the drug produces a sustained glow"

4. The state of glowing with heat and light
5. Light such as is emitted by a solid body heated to luminosity incandescence

noun

1. A luminous electrical discharge without sparks through a gas

noun

1. A gas-discharge electric lamp in which most of the light proceeds from the glow of the gas near the cathode

noun

1. A heating element in a diesel-engine cylinder to preheat the air and facilitate starting

noun

1. A tall branching composite herb (Rudbeckia laciniata hortensia) with showy yellow flower heads

noun

1. Airglow seen at twilight