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| u·re·din·i·um [ yrə dínnee əm ] (plural u·re·din·i·a [ yrə dínnee ə ]) or u·re·di·um [ y rdee əm ] (plural u·re·di·a [ y rdee ə ]) |
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mass of spores: a reddish or black mass of spores produced on a plant by a rust fungus
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| [Early 20th century. < Latin uredin-, stem of uredo (see uredo)] |
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