actinometer
/ˌæktɪˈnɑmɪtər/
noun
- An instrument that measures the intensity of radiation, especially sunlight.
- Gardeners sometimes use an actinometer to decide where to place plants that need full sun.
- The weather station's actinometer showed a sharp drop in radiation as the clouds rolled in.
- The scientist used an actinometer to record the amount of solar energy reaching the ground.
Synonyms