Sepal
Sepal , noun
[New Latin sepalum, formed in imitation of New Latin petalum, petal, to denote one of the divisions of the calyx: compare French sépale.]
(Botany) A leaf or division of the calyx.
When the calyx consists of but one part, it is said to be monosepalous; when of two parts, it is said to be disepalous; when of a variable and indefinite number of parts, it is said to be polysepalous; when of several parts united, it is properly called gamosepalous.