n :  the low-temperature emission of light produced esp. by physiological processes (as in the firefly), by chemical action, by friction, or by electrical action : also  :  light produced by luminescence lu*mi*nesce vi -nesced  -nesc*ing  lu*mi*nes*cent adj 
 
 
 
Published under license with Merriam-Webster, Incorporated.  © 1997-2024.