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From The Collaborative International Dictionary of English v.0.48:
Sepal \Se"pal\, n. [NL. sepalum, formed in imitation of NL. petalum, petal, to denote one of the divisions of the calyx: cf. F. s['e]pale.] (Bot.) A leaf or division of the calyx. [1913 Webster] Note: 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. [1913 Webster]