noun Download 🔗Share 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. Examples : "The vibrant red corollas of the poppies stood out against the green field, their petals clearly distinct from the surrounding sepals. " biology plant nature part organism Chat with AIVocabulary GamePractice Reading