1. energy in the form of waves or particles that travels through space or matter
Usage: physics
2. harmful energy given off by radioactive substances
3. medical treatment using high-energy rays to destroy cancer cells
Usage: medical

Examples

• The sun emits radiation that reaches Earth as light and heat.
• Workers at the nuclear plant wear protective suits to shield them from radiation.
• Solar radiation can cause sunburn if you stay outside too long.
• The cancer patient received radiation treatment three times a week.
• Scientists measured the radiation levels near the reactor.
• Ultraviolet radiation from the sun can damage your skin.
• The heat radiation from the fire warmed the entire room.