Definition of "counterglow" []

• See gegenschein. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "This is the Gegenschein, derived from a German word meaning "counterglow," since it is always opposite or "counter" in position to the sun in the sky."
• "• there is sufficient material at the-Earth-Moon libration points L4 and L5 to produce a solar counterglow of 20 S10 Vis brightness"