Definition

1. Verb:
   • To emit light of a visible color when exposed to ultraviolet or other high-energy radiation: This is the primary scientific meaning. A substance that fluoresces absorbs light at one wavelength (usually invisible) and almost immediately re-emits it at a longer, visible wavelength. The light stops as soon as the energy source is removed.
   • To undergo fluorescence: This describes the process itself.

Usage

• The verb fluoresce is used to describe the specific physical process where a material glows under certain types of light. It is an intransitive verb; it does not take a direct object. You say a substance , not that you something.
• It is most commonly used in scientific, medical, and technical contexts (e.g., chemistry, biology, mineralogy, forensics).

Examples

• Scientific Context:
  • Certain minerals fluoresce brilliantly under a black light.
  • The dye was designed to fluoresce when bound to specific proteins.
  • The jellyfish protein will fluoresce green when exposed to blue light.

Advanced Usage

• "to fluoresce in": To emit a specific color during fluorescence.
  • The compound is known to fluoresce in the red part of the spectrum.
• The process or property is fluorescence (noun). The adjective describing a substance capable of this is fluorescent.

Variants and Related Words

• Fluorescence (n): The property or process of fluorescing.
  • The fluorescence of the sample was measured.
• Fluorescent (adj): Having the property of fluorescence; emitting light via fluorescence.
  • A fluorescent marker was used.
  • The fabric contained fluorescent dyes.
• Fluorophore (n): A chemical compound that can fluoresce.

Synonyms

• Glow: A more general term for emitting light, but not specific to the immediate, energy-dependent process of fluorescence.
• Luminesce: A broader term meaning to emit light from any non-thermal process, which includes fluorescence, phosphorescence, and chemiluminescence.

Related Phrases/Idioms

• Fluoresce under UV light: A very common collocation specifying the activating energy source.
  • Security features on the passport fluoresce under UV light.

Verb

1. exhibit or undergo fluorescence