Definition of peridium in English:

peridium

noun

Botany
  • The outer skin of a sporangium or other fruiting body of a fungus.

    • ‘Numerous golden sporangia with persistent peridia still intact formed on the bark surface and on mosses.’
    • ‘This is an example of a peridium, a rather vague term that includes any shell or membrane that encloses spores - for example, the visible outer membrane of a puffball.’

Origin

Early 19th century: from Greek pēridion, literally small wallet, diminutive of pēra.

Pronunciation:

peridium

/pɪˈrɪdɪəm/