Etymology
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chromosphere (n.)

"gaseous envelope around the sun," 1868, coined by English astronomer Sir Joseph Norman Lockyer (1836-1920), from chromo-, from Greek khrōma "color" (see chroma) + sphere. So called for its redness. Related: Chromospheric.

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Definitions of chromosphere

chromosphere (n.)
a gaseous layer of the sun's atmosphere (extending from the photosphere to the corona) that is visible during a total eclipse of the sun;
From wordnet.princeton.edu