Fluorescent (adjective)

1. Emitting light when exposed to ultraviolet radiation.
2. Having a bright, vivid color.
3. Having or producing a bright, vivid light.

Origin:

Early 20th century: from french fluorescence, from fluo- "flowing" + -escence.

Examples:

1. The T-shirt was fluorescent.
2. The fish had fluorescent scales.
3. The paint was fluorescent under black light.
4. The sign had a fluorescent light.
5. The poster was fluorescent.