[ loo-muh-nes-uhnt ]
Part of SpeechadjectiveOrigin + Etymology
1884; German; coined by German physicist Eilhard Wiedemann (1852-1928) from Latin lumen (genitive luminis) "light" (from suffixed form of PIE root *leuk- "light, brightness")
adjectiveemitting light that is not caused by incandescence and that occurs at a temperature below that of incandescent bodies:
adjectiveThe stained glass windows in the foyer were luminescent as the sun went down.
Usage Over Time