Bot. a pustule, often found on the epidermis of grasses, formed by a rust fungus and consisting of uredospores
Origin of urediniumModern Latin ; from Classical Latin uredo (gen. uredinis), blight: see uredo and amp; -ium
nounpl. u·re·din·i·a also u·re·di·a
A reddish pustulelike structure that is formed in the tissue of a plant infected by a rust fungus and produces urediniospores.
Origin of urediniumNew Latin &umacron;r&emacron;dinium, from Latin &umacron;r&emacron;d&omacron;, &umacron;r&emacron;din-, blight, from &umacron;rere, to burn.