verb

give out steady light without flame.

the tips of their cigarettes glowed in the dark

radiate heat,burn without flames,smoulder

noun

a steady radiance of light or heat.

the setting sun cast a deep red glow over the city

radiance,light,brightness,luminosity,shine,gleam,glimmer,incandescence,phosphorescence,luminescence,richness,vividness,brilliance,warmth,heat,lambency,lucency,irradiance