Noun | 1. | ![]() sepal - one of the green parts that form the calyx of a flower hull - persistent enlarged calyx at base of e.g. a strawberry or raspberry chlamys, floral envelope, perianth, perigone, perigonium - collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils pappus - calyx composed of scales or bristles or featherlike hairs in plants of the Compositae such as thistles and dandelions |