corolla

[kuh-rol-uh]
noun Botany.
the inner envelope of floral leaves of a flower, usually of delicate texture and of some color other than green; the petals considered collectively.

Origin:
1665–75; < Latin: little garland, equivalent to corōn(a) garland, corona + -la diminutive suffix; see -ule

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
corolla (kəˈrɒlə)
 
n
Compare calyx the petals of a flower collectively, forming an inner floral envelope
 
[C17 dim. of L corōna crown]

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

corolla
1670s, from L. corolla, dim of corona "crown, garland" (see crown). Botanical use is from 1753.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
corolla   (kə-rŏl'ə, kə-rō'lə)  Pronunciation Key 
The petals of a flower considered as a group or unit. See more at flower.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
These flowers have no corolla, the group of petals that normally color flowers.
Describing a corolla that has a short tubular portion and widely spreading lobes so that the whole corolla is saucer-shaped.
The petals are fused into a two-lipped corolla with a slightly longer lower lip.
The corolla is strongly two-lipped with a lavender-blue to lavender-rose corolla tube and throat.
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