from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of the relatively cool dark spots appearing periodically in groups on the surface of the sun that are associated with strong magnetic fields.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A region on the sun's surface with a lower temperature than its surroundings and intense magnetic activity.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a cooler darker spot appearing periodically on the sun's photosphere; associated with a strong magnetic field
Sorry, no etymologies found.