sunspot

[suhn-spot]
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.

Origin:
1805–15; sun + spot

sunspotted, adjective
sunspottedness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
sunspot (ˈsʌnˌspɒt)
 
n
1.  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
2.  informal a sunny holiday resort
3.  (Austral) a small cancerous spot produced by overexposure to the sun
 
'sunspotted
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
sunspot   (sŭn'spŏt')  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

sunspots definition


Dark spots on the surface of the sun caused by magnetic storms.

Note: The number of sunspots goes through a maximum and minimum about every eleven years. During periods of maximum sunspots, the elementary particles associated with the spots cause disturbances in the atmosphere of the Earth and interfere with radio and television communication.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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FOLDOC
Computing Dictionary

sunspots definition


1. Notional cause of an odd error. "Why did the program suddenly turn the screen blue?" "Sunspots, I guess."
2. Also the cause of bit rot - from the myth that sunspots will increase cosmic rays, which can flip single bits in memory. See also phase of the moon.
[Jargon File]

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
The sunspots have continued to let loose smaller flares and may still be active
  now.
Solar flare activity stopped cold and weeks and months went by without any
  sunspots, or areas of intense magnetism.
Twice a day visitors can glimpse sunspots, flares, and other solar activity.
Sunspots are regions of intense magnetic activity on the sun's surface.
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