fluoresce: meaning, definition, pronunciation and examples
LowTechnical/Scientific
Quick answer
What does “fluoresce” mean?
To emit light of a different colour after absorbing light or other electromagnetic radiation.
Audio
Pronunciation
Definition
Meaning and Definition
To emit light of a different colour after absorbing light or other electromagnetic radiation.
To become brightly visible or glow due to the absorption of energy, often used metaphorically for sudden vividness or visibility.
Dialectal Variation
British vs American Usage
Differences
No significant spelling or grammatical differences. Potential minor variation in pronunciation.
Connotations
Identical technical connotations. Metaphorical use slightly more common in American popular science writing.
Frequency
Equally low frequency in both dialects, confined to scientific, medical, and certain technical contexts.
Grammar
How to Use “fluoresce” in a Sentence
Subject (Material) + fluoresce + (Adverbial: e.g., under UV light)Subject (Agent) + make + Object (Material) + fluoresceVocabulary
Collocations
Examples
Examples of “fluoresce” in a Sentence
verb
British English
- The mineral will fluoresce under a UV lamp.
- The security features on the banknote fluoresce a brilliant green.
American English
- The protein fluoresces when tagged with this dye.
- These rocks fluoresce in various colors.
Usage
Meaning in Context
Business
Rare. Possibly in marketing for high-visibility products or safety gear.
Academic
Common in chemistry, biology, physics, geology, and materials science.
Everyday
Very rare. Might be used when discussing glow-in-the-dark items or black lights.
Technical
Core term in spectroscopy, microscopy, medical imaging, forensic analysis, and mineralogy.
Watch out
Common Mistakes When Using “fluoresce”
- Using it transitively (*'He fluoresced the liquid'). Use 'make fluoresce' or 'cause to fluoresce'.
- Confusing with 'phosphoresce' (glow after the energy source is removed).
FAQ
Frequently Asked Questions
Not exactly. 'Fluoresce' is a specific type of glowing that happens immediately while the energy source is present and stops nearly instantly when it's removed. 'Glow' is a more general term.
No. 'Fluoresce' is intransitive. The subject is the thing that glows. You cannot 'fluoresce' something else. Correct: 'The substance fluoresces.' Incorrect: 'The lamp fluoresces the substance.'
The related noun is 'fluorescence'. The adjective is 'fluorescent'.
Fluorescence stops almost immediately when the energy source is removed. Phosphorescence continues for a longer time (like glow-in-the-dark stars).
To emit light of a different colour after absorbing light or other electromagnetic radiation.
Fluoresce is usually technical/scientific in register.
Fluoresce: in British English it is pronounced /ˌflʊəˈrɛs/, and in American English it is pronounced /ˌflʊˈrɛs/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “[No common idioms. The word itself is technical.]”
Learning
Memory Aids
Mnemonic
Think: 'FLUOresce' like 'FLUOrite', the mineral. A 'FLUOrescent' light FLUOresces.
Conceptual Metaphor
TO BE VISIBLY ENERGISED / TO REVEAL HIDDEN QUALITIES (e.g., 'The data fluoresced under new analysis.').
Practice
Quiz
What does it mean for a substance to 'fluoresce'?