se·pal /ˈsipəl, ˈsɛ-/
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Se·pal n. Bot. A leaf or division of the calyx.
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.
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sepal
n : one of the green parts that form the calyx of a flower