Meaning of “fluorescent” in the English Dictionary

"fluorescent" in British English

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(Definition of “fluorescent” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"fluorescent" in American English

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us /ˌflʊˈres·ənt, ˌflɔ-, ˌfloʊ-/

(of a substance) giving off a very bright light when electricity or other waves go through it:

The map was marked with a thin, fluorescent-green line.

(Definition of “fluorescent” from the Cambridge Academic Content Dictionary © Cambridge University Press)