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u·re·din·i·o·spore(yo͝or′ĭ-dĭn′ē-ə-spôr′) also u·re·do·spore (yo͝o-rē′də-)
A dikaryotic often reddish spore of most rust fungi. Urediniospores disperse widely, spreading infection within a host plant and to other plants.
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) any of the brownish spores that are produced in each uredium of the rust fungi and spread the infection between hosts
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014