noun Astronomy.
a scarlet, gaseous envelope surrounding the sun outside the photosphere, from which enormous quantities of hydrogen and other gases are erupted.
a gaseous envelope surrounding a star.

1865–70; chromo- + -sphere

chromospheric [kroh-muh-sfer-ik, -sfeer-] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
chromosphere (ˈkrəʊməˌsfɪə)
a gaseous layer of the sun's atmosphere extending from the photosphere to the corona and visible during a total eclipse of the sun

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1868, from chromo-, from Gk. khrome "color" + -sphere. So called for its redness.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
chromosphere   (krō'mə-sfîr')  Pronunciation Key 
A glowing, transparent layer of gas surrounding the photosphere of a star. The Sun's chromosphere is several thousand kilometers thick, is composed mainly of hydrogen at temperatures of 6,000° to 20,000°K, and gives off reddish light.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
With a hydrogen alpha solar telescope, you can observe prominences and filaments in the chromosphere.
The chromosphere can be seen only when filtering out the bright light of the photosphere.
The chromosphere is more visually transparent than the photosphere.
Images for chromosphere
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