Etymology
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sunspot (n.)

also sun-spot, 1849, in astronomy, from sun (n.) + spot (n.). Earlier "a spot on the skin caused by exposure to the sun" (1818).

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Definitions of sunspot

sunspot (n.)
a cooler darker spot appearing periodically on the sun's photosphere; associated with a strong magnetic field;
Synonyms: macula
From wordnet.princeton.edu