What does "luminesce" mean?

To give off light, including in the invisible electromagnetic radiation frequencies, or become luminescent.

What is a synonym for "luminesce"?

Common synonyms include: beam, emitted, fluoresce, fluoresces, fluorescing, gleam.

/ˌlumɪˈnɛs/ verb

verb ·Rare ·Advanced level

Verb

1
To give off light, including in the invisible electromagnetic radiation frequencies, or become luminescent. intransitive
"Phosphorus will only begin to luminesce at a certain small pressure of oxygen."
2
be or become luminescent; exhibit luminescence wordnet

"Phosphorus will only begin to luminesce at a certain small pressure of oxygen."

Back-formation from luminescent.