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In some senses, perigonium is marked as dated. Watch for register when choosing this word.
perigonium
noun 3
Definitions
noun
1
The sterile parts of a flower; collectively, the sepals and petals (or tepals); the perianth.
2
The modified leaves around the antheridia in a bryophytic plant.
3
The wall of the sporosac in a hydroid.
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