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plural corollas or corollae or corollæ
(botany) An outermost-but-one whorl of a flower, composed of petals, when it is not the same in appearance as the outermost whorl (the calyx); it usually comprises the petal, which may be fused. quotations examples
Our wet fingers touched and we formed a circle like the corolla of a flower, floating into the silence of the desert dawn with the ancient sun on our bodies.
1974, Lawrence Durrell, Monsieur, Faber & Faber, published 1992, page 125