noun Botany.
- one of the divisions of a flower perianth, especially one that is not clearly differentiated into petals and sepals, as in lilies and tulips.
noun
- any of the subdivisions of a perianth that is not clearly differentiated into calyx and corolla
- A division of the perianth of a flower in which the sepals and petals are indistinguishable, as in tulips and lilies.