sunspot

noun

sun·​spot ˈsən-ˌspät How to pronounce sunspot (audio)
: any of the dark spots that appear at times on the sun's surface and are usually visible only through a telescope

Examples of sunspot in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Tuesday, May 28, 2024: Old sunspot group AR3664, the most active sunspot region of the current solar cycle — the one responsible for the May 2024 solar storms, announced its return in explosive fashion. Space.com Staff, Space.com, 1 Jan. 2025 During this phase, sunspot activity increases, leading to more frequent solar flares and CMEs, which are the main drivers of auroras. Jamie Carter, Forbes, 5 Dec. 2024 The main way scientists can tell that the sun has reached its maximum is by monitoring sunspot formation. Denise Chow, NBC News, 1 Dec. 2024 CMEs are huge plumes of solar plasma that have been spat out from magnetically active areas of the sun's surface, usually sunspots. Jess Thomson, Newsweek, 27 Nov. 2024 See all Example Sentences for sunspot 

Word History

First Known Use

1676, in the meaning defined above

Time Traveler
The first known use of sunspot was in 1676

Dictionary Entries Near sunspot

Cite this Entry

“Sunspot.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sunspot. Accessed 16 Feb. 2025.

Kids Definition

sunspot

noun
sun·​spot -ˌspät How to pronounce sunspot (audio)
: one of the dark spots that appear from time to time on the sun's surface and are usually visible only through a telescope

More from Merriam-Webster on sunspot

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!