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.

Origin of chromosphere

First recorded in 1865–70; chromo- + -sphere
Related formschro·mo·spher·ic [kroh-muh-sfer-ik, -sfeer-] /ˌkroʊ məˈsfɛr ɪk, -ˈsfɪər-/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for chromosphere

Historical Examples of chromosphere

  • The outer surface of the chromosphere is not by any means even.

    Astronomy of To-day

    Cecil G. Dolmage

  • Their light shines through the chromosphere and the spots are ruptures in this envelope.


    David Todd

  • Beneath the chromosphere is the layer of the sun from which emanates the light by which we see it, called the photosphere.


    David Todd

  • He argues that it is formed within the mass of cooled hydrogen drawn from the chromosphere into the vortex of the cyclone.

  • The greater the solar activity the more is the chromosphere charged with the vapors of the lower strata of the sun's atmosphere.

    Astronomy for Young Folks

    Isabel Martin Lewis

British Dictionary definitions for chromosphere



a gaseous layer of the sun's atmosphere extending from the photosphere to the corona and visible during a total eclipse of the sun
Derived Formschromospheric (ˌkrəʊməˈsfɛrɪk), adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for chromosphere

1868, coined by English astronomer Sir Joseph Norman Lockyer (1836-1920), from chromo-, from Greek khroma "color" (see chroma) + sphere. So called for its redness.

Online Etymology Dictionary, © 2010 Douglas Harper

Science definitions for chromosphere



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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.