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period piece
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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"]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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