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photosphere (n.)

1660s, "orb of light, envelop of light," from photo- "light" + sphere. Astronomical sense "luminous envelop around the sun (or another star)" is from 1848. Related: Photospheric.

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Definitions of photosphere from WordNet

photosphere (n.)
the intensely luminous surface of a star (especially the sun);
From wordnet.princeton.edu