Definify.com

Webster 1828 Edition

ppr.

Shining with intense heat; white with heat.

Burning with vehement heat.

Exhibiting a bright color; red; as a glowing color; glowing cheeks.

Ardent; vehement; animated; as glowing zeal.

Inflamed; as a glowing breast.

glowing

glowing ‎(plural glowings)

The action of the verb glow.
- 1791, Robert Jackson, A Treatise on the Fevers of Jamaica (page 287)
  The coldness having now arrived at its acme, or highest point of intensity, glowings of heat were perceived in the intervals between the rigors or successions. These glowings grew gradually stronger […]

glowing ‎(comparative more glowing, superlative most glowing)

That glows or glow.
glowing embers
(figuratively) Full of praise.
He received glowing references from his previous employers.

that which glows