phosphor
nounUK /ˈfɒsfə/
US /ˈfɑːsfər/
A substance that glows in the dark after it has been in the light.
The stars on her ceiling were painted with phosphor so they shone at night.
RELATED WORDS
OTHER MEANINGS
2. The chemical element phosphorus, especially in its white form that glows faintly in the dark.
Early chemists studied phosphor because it seemed to shine with its own light.
3. A substance used to coat the inside of screens, such as in old televisions, that lights up when hit by electrons.
The phosphor coating on the screen made the picture glow.
4. The morning star, or the planet Venus when seen at dawn.
Ancient sailors watched for phosphor rising before the sun.