From WordNet (r) 2.0 (August 2003) [wn]:
fluorescent
adj 1: emitting light during exposure to radiation from an external
source
2: brilliantly colored and apparently giving off light;
"fluorescent colors"
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Fluorescent \Flu`o*res"cent\, a.
Having the property of fluorescence.
[1913 Webster]