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peridium

pe·rid·i·um [ pə ríddee əm ] (plural pe·rid·i·a [ pə ríddee ə ])


noun 
Definition:
 
part of fungus: the covering of the spore-bearing organ in many kinds of fungi

[Early 19th century. Via modern Latin< Greek pēridion "small leather wallet" < pēra "wallet"]
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