An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

Of little breadth or → width.

M.E., from O.E. nearu; cf. O.S. naru "narrow," Du. naar "unpleasant;" akin to Ger. Narbe "scar," literally, "narrow mark."

Bârik, from Mid.Pers. bârîk "narrow," from O.Iranian *bāra-ya-ka-, from stem *bāra- "to cut;" cf. Av. bāra- "edge, blade," in tiži-bāra- "sharp-edged," from brī- "to cut, shave, shear;" cf. Skt. bhrī- "to hurt, injure," bhrinanti "they hurt;" O.C.S. briti "to shave;" PIE base *bhrē- "to cut, pierce."

Optics: Of a filter, same as → interference filter.
Radio.: Encompassing a small frequency range, typically less than 300 Hz.

→ narrow; → band.

Photometry using narrow-band filters to isolate a particular spectroscopic line or molecular band.

→ narrow band; → photometry.

The outer region of a → quasar or an → active galactic nucleus displaying narrow spectral lines. Also called Type II AGN. See also → obscuring torus.

→ narrow; → line; → region.