An Etymological Dictionary of Astronomy and Astrophysics

Unwanted secondary window in a filter band pass, on the red side of the main window.

Etymology (EN): → red; leak, from M.E leken, from O.N. leka “to drip, leak;” akin to Du. lek, Ger. lech “leaky,” O.E. leccan “to moisten.”

Etymology (PE): Našt “leak, leakage,” of unknown origin; sorx, → red.