perianthial

perianth

[per-ee-anth]
noun Botany.
the envelope of a flower, whether calyx or corolla or both.

Origin:
1700–10; earlier perianthium < Neo-Latin. See peri-, anth-, -ium

perianthial, adjective
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World English Dictionary
perianth (ˈpɛrɪˌænθ)
 
n
the outer part of a flower, consisting of the calyx and corolla
 
[C18: from French périanthe, from New Latin, from peri- + Greek anthos flower]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

perianth
"envelope of a flower," 1706, from Fr. périanthe, from Mod.L. perianthium (17c.), lit. "that which is round the flower," from peri- + Gk. anthos "flower" (see anther).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
perianth   (pěr'ē-ānth')  Pronunciation Key 
The sepals and petals of a flower considered together.
The American Heritage® Science Dictionary
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