Etymology
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corolla (n.)

1670s, "a small crown," from Latin corolla "a garland, a little crown," diminutive of corona "crown, garland" (see crown (n.)). Botanical use is from 1753. Related: Corollaceous.

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Definitions of corolla

corolla (n.)
(botany) the whorl of petals of a flower that collectively form an inner floral envelope or layer of the perianth;
we cultivate the flower for its corolla
From wordnet.princeton.edu