- emitting light that is not caused by incandescence and that occurs at a temperature below that of incandescent bodies: The luminescent watch hands glow 100 times brighter than those on standard watches, allowing wearers to read the time in complete darkness.
- glowing or shining, or producing an impression of light; lustrous; radiant: Her gloriously luminescent voice, described by the New York Times as "hauntingly clear," evokes other-worldly sounds wafting from a mountaintop convent.
