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sunspot

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noun sun·spot \-ˌspät\

Simple Definition of sunspot

  • astronomy : a dark spot that sometimes appears on the surface of the sun

Source: Merriam-Webster's Learner's Dictionary

Full Definition of sunspot

  1. :  any of the dark spots that appear at times on the sun's surface and are usually visible only through a telescope

1868

First Known Use of sunspot

1868


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