phosphorescentsubstance
nounUK /ˌfɒsfəˈrɛsənt ˈsʌbstəns/
US /ˌfɑːsfəˈrɛsənt ˈsʌbstəns/
A thing that glows in the dark after the light is turned off.
The stars on my ceiling are made of a phosphorescentsubstance that shines all night.
RELATED WORDS
OTHER MEANINGS
2. A chemical that gives off light without getting hot.
Scientists studied the phosphorescentsubstance to learn how it makes light.
3. A paint or coating used on toys and signs so they shine at night.
He painted a phosphorescentsubstance on his bike so cars could see him.
4. Any material that keeps glowing for a while after light hits it.
The watch hands were covered with a phosphorescentsubstance.