Definitions from Wiktionary (perigonium)

▸ noun:  (botany) The sterile parts of a flower; collectively, the sepals and petals (or tepals); the perianth.
▸ noun:  (botany) The modified leaves around the antheridia in a bryophytic plant.
▸ noun:  (dated, zoology) The wall of the sporosac in a hydroid.



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