Webster's English Dictionary

Enter the word to look up:

fluorescence

flu.o.res.cence \-'es-*n(t)s\ \-*nt\ n : emission of or the property of 
   emitting electromagnetic radiation usu. a s visible light resulting from 
   and only during the absorption of radiation from some other source; also : 
   the radiation emitted - flu.o.res.cent aj