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u·re·din·i·um(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.]
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]