What does luminesce mean?
Luminesce means to give off light without the light necessarily resulting from something being heated. The term is especially associated with scientific phenomena such as bioluminescence, in which living organisms produce light, and chemiluminescence, in which a chemical reaction releases energy as light. It can also describe materials that absorb light and re-emit it, as with fluorescent substances. In less technical writing, luminesce may evoke a faint or mysterious radiance, as though a person, object, or place were glowing softly. The word is more formal than the everyday verb “glow” and is particularly useful when the source or mechanism of the light matters. Although luminescence and incandescence are distinct, both are forms of light emission; the former is not dependent solely on a material becoming hot enough to glow.
verbTo emit light, especially through a process other than incandescence. It may describe light produced by living organisms, chemical reactions, or the absorption and re-emission of light by a substance.
- To emit light, especially as a result of a process other than heating.
- To have a subtle radiance or glow.
"The fluorescent mineral continued to luminesce faintly in the darkened room."
"Bacteria in the sample began to luminesce when the nutrient was added."
"The old silk fabric seemed to luminesce in the fading evening light."
Fireflies luminesce without burning: their light is a chemical performance rather than a source of heat.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does luminesce come from?
Luminesce was formed in the 19th century from Latin lumen, meaning “light,” together with the suffix -escere, which commonly expresses the beginning of an action or a gradual development. The verb therefore suggests the emission or development of light. Its vocabulary relatives include illuminate, luminous, luminosity, and luminary, all of which continue the Latin root for light.
Related word forms
How luminesce is actually used
Luminesce is a formal or scientific verb. In technical contexts, it refers to the emission of light by processes such as fluorescence, phosphorescence, chemiluminescence, or bioluminescence; in literary use, it can describe a subtle radiance.
Easily confused with luminesce
Luminesce means to produce light, whereas illuminate more commonly means to light a space or make something easier to understand.