u·re·din·i·o·spore 
(yr′ĭ-dĭnē-ə-spôr′) also u·re·do·spore (y-rēdə-)
(yr′ĭ-dĭnē-ə-spôr′) also u·re·do·spore (y-rēdə-)n.
A dikaryotic often reddish spore of most rust fungi. Urediniospores disperse widely, spreading infection within a host plant and to other plants.
[URED(INIUM) + SPORE.]