Also found in: Medical, Encyclopedia, Wikipedia.
1. The outermost layer of the wall of certain spores.
2. An asexual spore developed externally by budding, as from a sporophore.
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.
(Botany) the outer layer of the spores of some algae and fungi
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
ex•o•spore(ˈɛk səˌspɔr, -ˌspoʊr)
the outer coat of a spore.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.