noun Botany.
one of the individual leaves or parts of the calyx of a flower.

< Neo-Latin sepalum (1790), irregular coinage based on Greek sképē covering and Latin petalum petal

sepaled, sepalled, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sepal (ˈsɛpəl)
any of the separate parts of the calyx of a flower
[C19: from New Latin sepalum: sep-, from Greek skepē a covering + -alum, from New Latin petalumpetal]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"leaf of the calyx," 1821, from Fr. sépal, from Mod.L. sepalum (H.J. de Necker, 1790), coined from L. separatus "separate" + petalum "petal."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
sepal   (sē'pəl)  Pronunciation Key 
One of the usually separate, green parts that surround and protect the flower bud and extend from the base of a flower after it has opened. Sepals tend to occur in the same number as the petals and to be centered over the petal divisions. In some species sepals are colored like petals, and they can even be indistinguishable from petals, as in the lilies (in what are called tepals). In some groups, such as the poppies, the sepals fall off after the flower bud opens. See more at flower.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The first basic thing is that they all have three sepals and three petals.
Referring to the position of the ovary when it is below the point of attachment
  of the sepals and petals.
When they bloom, the stamens grow up between and above the sepals to release
  pale yellow pollen.
The upper two petals are shorter and broader than the sepals.
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