exoperidium

[ek-soh-puh-rid-ee-uh m]
noun, plural ex·o·pe·rid·i·a [ek-soh-puh-rid-ee-uh] /ˌɛk soʊ pəˈrɪd i ə/. Mycology.
  1. the outer of the two layers into which the peridium is divided.

Origin of exoperidium

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Historical Examples of exoperidium