An Etymological Dictionary of Astronomy and Astrophysics

The portion of the electromagnetic spectrum that is permitted to pass through an electronic device, such as a radio telescope detector. The term refers to either a wavelength interval or a frequency interval.

Etymology (EN): Bandwidth, from → band + → width.

Etymology (PE): Bândpahnâ, from bând, → band, + pahnâ, → width, from pahn “wide,”
→ broad.