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Definition of Aecium
1. Noun. Fruiting body of some rust fungi bearing chains of aeciospores. 
Definition of Aecium
1. a spore-producing organ of certain fungi [n -IA]
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1. Noun. Fruiting body of some rust fungi bearing chains of aeciospores. 
1. a spore-producing organ of certain fungi [n -IA]