dayglow

[ dey-gloh ]
/ ˈdeɪˌgloʊ /

noun

See under airglow.

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Origin of dayglow

First recorded in 1955–60; day + glow

Definition for dayglow (2 of 2)

airglow
[ air-gloh ]
/ ˈɛərˌgloʊ /

noun

a dim light from the upper atmosphere caused by emissions from atoms and molecules ionized by solar radiation: observed at night (nightglow), during the day (dayglow), and at twilight (twilight glow), with each having slightly different characteristics.

Origin of airglow

First recorded in 1950–55; air1 + glow
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for dayglow

airglow
/ (ˈɛəˌɡləʊ) /

noun

the faint light from the upper atmosphere in the night sky, esp in low latitudes
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for dayglow

airglow
[ ârglō′ ]

A faint photochemical luminescence in the upper atmosphere caused by the collision of x-rays and charged particles from the Sun with atoms and molecules, especially of oxygen, sodium, and the hydroxyl radical (OH). Airglow is strongest over low and middle latitudes.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.