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 (yo͝or′ĭ-dĭn′ē-əm) also u·re·di·um (yo͝o-rē′dē-əm)
n. pl. u·re·din·i·a (-dĭn′ē-ə) also u·re·di·a (-dē-ə)
A reddish pustulelike structure that is formed in the tissue of a plant infected by a rust fungus and produces urediniospores.

[New Latin ūrēdinium, from Latin ūrēdō, ūrēdin-, blight, from ūrere, to burn.]
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.


(jʊˈriːdɪəm) or


n, pl -dia (-dɪə) or -dinia (-ˈdɪnɪə)
(Botany) a spore-producing body of some rust fungi in which uredospores are formed. Also called: uredosorus
[C20: from New Latin, from uredo]
uˈredial adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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References in periodicals archive ?
The uredial sample accessions used in the marker test included 23 asexual isolates collected from commercial wheat field and breeding plots maintained by rust research scientists and cooperators nationwide and 30 sexual uredio-pustule isolates produced by aeciospore infection.