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Definition of: peridium
(pə·rid′ē·əm) noun plural ·i·a (-ē·ə) Bot.
The outer coat or coats of an angiocarpous fungus, forming a complete investment of the fructification, as in puffballs. [<NL <Gk. pēridion, dim. of pēra a leather bag]
—pe·rid′·i·al adjective
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