PHOSPHORESCENT
phosphorescent
(adjective) emitting light without appreciable heat as by slow oxidation of phosphorous; “the phosphorescent glow of decaying wood”
Source: WordNet® 3.1
Etymology
Adjective
phosphorescent (comparative more phosphorescent, superlative most phosphorescent)
Having the property of emitting light for a period of time after the source of excitation is taken away, e.g, in electrostatic storage tubes and cathode-ray tubes.
Noun
phosphorescent (plural phosphorescents)
A phosphorescent substance.
Source: Wiktionary
Phos`phor*es"cent, a. Etym: [Cf. F. phosphorescent.]
Definition: Shining with a phosphoric light; luminous without sensible
heat.
– n.
Definition: A phosphorescent substance.
Source: Webster’s Unabridged Dictionary 1913 Edition