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Denotation vs. Connotation

nightglow

[nahyt-gloh] /ˈnaɪtˌgloʊ/
noun
1.
See under airglow.
Origin of nightglow
1950-1955
1950-55; night + glow

airglow

[air-gloh] /ˈɛərˌgloʊ/
noun
1.
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
1950-55; air1 + glow
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for nightglow

airglow

/ˈɛəˌɡləʊ/
noun
1.
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
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nightglow in Science
airglow
  (âr'glō')   
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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