Definition

1. Adjective:

   • Emitting visible light as a result of absorbing radiation from an external source: Describes a substance or object that glows brightly when exposed to ultraviolet light or other forms of electromagnetic radiation.
   • Brilliantly colored and appearing to give off light: Describes very bright, vivid colors that seem to glow, even in normal light.

2. Noun:

   • A lighting fixture that uses a fluorescent lamp: A complete unit, such as an overhead light, that contains a fluorescent tube for illumination.

Usage Examples

• Adjective:
  • The scientist used a fluorescent dye to track the cell's movement under a special microscope.
  • She wore a fluorescent pink jacket so she would be visible to cyclists at night.
• Noun:
  • The office was lit by long, humming fluorescents. (Here, "fluorescents" is a common informal shortening for "fluorescent lights" or "fluorescent fixtures".)

Advanced Usage

• Fluorescent marker/pen: A pen with ink that is very bright and visible, often used for highlighting text.
  • She underlined the key points with a fluorescent yellow marker.
• Fluorescent in situ hybridization (FISH): A laboratory technique used in genetics and medical diagnostics.
  • FISH is a fluorescent technique that allows researchers to visualize specific DNA sequences on chromosomes.

Variants and Related Words

• Fluorescence (n): The property or process of emitting light upon exposure to radiation.
  • The mineral's fluorescence under UV light was stunning.
• Fluoresce (v): To exhibit fluorescence; to emit light.
  • Certain proteins will fluoresce when tagged with the correct chemical.

Synonyms

• Adjective (for color): Neon, Day-Glo, luminous, vivid.
• Adjective (for light emission): Luminescent, glowing, phosphorescent (note: phosphorescent implies light emission that continues after the radiation source is removed).

Related Phrases

• Fluorescent lamp/tube/light bulb: The specific glass tube within a fixture that produces light via fluorescence.
  • We replaced the old incandescent bulbs with energy-efficient fluorescent tubes.
• Fluorescent light: The illumination produced by a fluorescent lamp.
  • The harsh fluorescent light in the supermarket gave her a headache.

Adjective

1. brilliantly colored and apparently giving off light
   • fluorescent colors
2. emitting light during exposure to radiation from an external source

Noun

1. a lighting fixture that uses a fluorescent lamp