An Etymological Dictionary of Astronomy and Astrophysics

The detection and measurement of radiant energy, either as separate wavelengths or integrated over a broad wavelength band, and the interaction of radiation with matter in such ways as absorption, reflection, and emission.

Etymology (EN): → radio + → -metry.

Etymology (PE): Tâbeš-sanji, from tâbeš, →radiation, + -sanj→ -metry.