geocoronal

ge·o·co·ro·na

[jee-oh-kuh-roh-nuh]
noun
a belt of ionized hydrogen surrounding the earth at the outer limit of the exosphere.

Origin:
1955–60; geo- + corona

ge·o·co·ro·nal, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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American Heritage
Science Dictionary
geocorona   (jē'ō-kə-rō'nə)  Pronunciation Key 
The halo of far-ultraviolet solar light that reflects off the Earth's exosphere.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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00:10
Geocoronal is always a great word to know.
So is ninnyhammer. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a fool or simpleton; ninny.
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