Definition of uredinium
: a usually reddish or black mass of hyphae and spores of a rust fungus forming pustules that rupture the host's cuticle
uredinialplay \-nē-əl\ adjective
Origin and Etymology of uredinium
New Latin, from Latin uredin-, uredo burning, blight, from urere to burn — more at ember
First Known Use: 1905
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