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sunspot

[ suhn-spot ]
/ ˈsʌnˌspɒt /
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noun
one of the relatively dark patches that appear periodically on the surface of the sun and affect terrestrial magnetism and certain other terrestrial phenomena.
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Origin of sunspot

First recorded in 1805–15; sun + spot

OTHER WORDS FROM sunspot

sunspotted, adjectivesun·spot·ted·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use sunspot in a sentence

British Dictionary definitions for sunspot

sunspot
/ (ˈsʌnˌspɒt) /

noun
any of the dark cool patches, with a diameter of up to several thousand kilometres, that appear on the surface of the sun and last about a week. They occur in approximately 11-year cycles and possess a strong magnetic field
informal a sunny holiday resort
Australian a small cancerous spot produced by overexposure to the sun

Derived forms of sunspot

sunspotted, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for sunspot

sunspot
[ sŭnspŏt′ ]

Any of the dark, irregular spots that usually appear in groups on the surface of the Sun (its photosphere), lasting from a few days to several weeks or more. Sunspots appear dark because they are cooler, by up to 1,500°K, than the surrounding photosphere. They are associated with strong magnetic fields and solar magnetic storms moving in a vortex pattern, similar to a tornado on Earth. The number of sunspots waxes and wanes over an 11-year period; at maximum activity there are often increased numbers of solar flares.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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