Definition of pyrheliometer in English:

pyrheliometer

(also pyroheliometer)

noun

Meteorology
  • An instrument for measuring solar radiation incident on the earth (the solar constant).

Origin

Mid 19th century; earliest use found in Reports of the British Association for the Advancement of Science. From pyro- + helio- + -meter, after French pyrhéliomètre.

Pronunciation

pyrheliometer

/pəːˌhiːlɪˈɒmɪtə/