Definition of actinometry in English:

actinometry

noun

  • The use of an actinometer; measurement of light intensity with the aid of an actinometer.

Origin

Mid 19th century; earliest use found in Matthew Maury (1806–1873). From actino- + -metry, after actinometer.

Pronunciation:

actinometry

/ˌaktɪˈnɒmɪtri/