nounWord forms: plural ˈumbrae (ˈʌmbri
; umˈbrē) or ˈumbras
3. the dark central part of a sunspot
Webster’s New World College Dictionary, Fourth Edition, compiled by the
editors of Webster’s New World Dictionaries. Copyright © 2010 by Houghton
Mifflin Harcourt. Published by Houghton Mifflin Harcourt. All rights reserved.
Word origin of 'umbra'L, a shade, shadow