yəˈrēdəˌspō(ə)r noun
or ure·do·spore -dəˌs- ; or ure·din·io·spore ˌyu̇rəˈdinēəˌs-
Etymology: urediospore alteration (influenced by New Latin uredium ) of uredospore; uredospore from New Latin Uredin-, Uredo + English -spore; urediniospore alteration (influenced by New Latin uredinium ) of uredospore
: one of the thin-walled yellow, orange, or reddish spores that are usually produced by the uredinia of rust fungi in repeated crops, are readily disseminated and quickly germinate to produce a vegetative mycelium which may give rise to other urediospores and thus further rapid spread of the fungus or especially later in the growing season may produce telia