noun, plural peridea [puh-rid-ee-uh] . Mycology.
the outer enveloping coat of the fruit body in many fungi.

1815–25; < Neo-Latin < German pērídion, diminutive of pḗra wallet; see -idium

peridial, adjective
peridiiform [puh-rid-ee-uh-fawrm] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
peridium (pəˈrɪdɪəm)
n , pl -ridia
the distinct outer layer of the spore-bearing organ in many fungi
[C19: from Greek pēridion a little wallet, from pēra leather bag, of obscure origin]

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