radiometer noun. [reɪdɪ'ɒmɪtǝ] E18.
[from RADIO- + -METER.]
1. An instrument for measuring angles. rare. Only in E18.

2. An instrument for detecting or measuring the intensity of (esp. infrared) electromagnetic radiation. Also, an instrument for measuring the intensity of sound by means of its radiation pressure. L19.

3. An instrument for determining the amount of X-radiation administered to a patient. E20.

■ radio'metric adjective (a) of or pertaining to a radiometer or its use; (b) of, pertaining to, or involving the measurement of radioactivity or ionizing radiation (

■ radiometric dating, isotopic dating): L19.

■ radio'metrically adverb by a radiometric method E20.

■ radiometry noun the use of a radiometer; spec. the detection and measurement of infrared radiation: L19.

[TahlilGaran] English Dictionary ▲