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Dictionary

air•glow

Pronunciation: (âr'glō"), [key]
—n.
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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

air gauge

air gun

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