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Meaning of airglow

air•glow

Pronunciation: (âr'glō"), [key]
— n.
  1. a dim light from the upper atmosphere caused by emissions from atoms and molecules ionized by solar radiation: observed at nightduring the dayand at twilightwith each having slightly different characteristics.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.