Photometer (noun)

An instrument used to measure the intensity, quality, or color of light.

Origin:

Derived from the greek word "phos" meaning light and "metron" meaning measure.

Examples:

1. The photometer was used to measure the intensity of light emitted by the stars.
2. The scientists used a photometer to measure the amount of light being emitted by the plant.
3. A photometer is an instrument for measuring the intensity of light.
4. Photometers are used in a wide variety of applications, from measuring the brightness of stars to determining the efficiency of light bulbs.
5. The photometer is an essential tool in the field of spectroscopy, which involves analyzing the properties of light and matter.