sunspot(redirected from Penumbra (Sun))
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Any of the relatively cool dark spots appearing periodically in groups on the surface of the sun that are associated with strong magnetic fields.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (Astronomy) 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. (Pathology) Austral a small cancerous spot produced by overexposure to the sun
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
one of the relatively dark patches that appear periodically on the surface of the sun and affect terrestrial magnetism and certain other terrestrial phenomena.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
Any of the relatively cool dark spots that appear in groups on the surface of the sun. Sunspots are associated with strong magnetic fields.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
One of many relatively cool dark spots that appear periodically on the surface of the Sun.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited
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|Noun||1.||sunspot - a cooler darker spot appearing periodically on the sun's photosphere; associated with a strong magnetic field|
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005
Collins English/French Electronic Resource. © HarperCollins Publishers 2005
sunspot[ˈsʌnˌspɒt] n (Astron) → macchia solare
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995
n. mancha de sol.
English-Spanish Medical Dictionary © Farlex 2012