Word Study
    Sepal
WORDNET DICTIONARY
Noun Sepal has 1 sense
- sepal(n = noun.plant) Array - one of the green parts that form the calyx of a flower; Array is a kind of floral leaf
is a part of calyx
CIDE DICTIONARY
Sepal, n. [NL. sepalum, formed in imitation of NL. petalum, petal, to denote one of the divisions of the calyx: cf. F. sépale.]. 
                                            
                                         A leaf or division of the calyx.                                                                                 [1913 Webster]                                                                                                                                    
                                                                                    
                                                    " 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]                                                
                                                                                                                                                                OXFORD DICTIONARY
Sepal, n.  Bot.  each of the divisions or leaves of the calyx.
                    Etymology
                        F s{eacute}pale, mod.L sepalum, perh. formed as SEPARATE + PETAL
                                    
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