Etymology
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perianth (n.)

in botany, "envelope of a flower," 1706, from French périanthe, from Modern Latin perianthium (17c.), literally "that which is round the flower," from Greek peri "around, about" (see peri-) + Greek anthos "flower" (see anther). Related: Perianthal.

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Definitions of perianth

perianth (n.)
collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils;
Synonyms: chlamys / floral envelope / perigone / perigonium
From wordnet.princeton.edu