Definition of sepal noun from the Oxford Advanced Learner's Dictionary

 

sepal

 noun
noun
BrE BrE//ˈsepl//
 
; NAmE NAmE//ˈsepl//
 
(specialist)
 
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a part of a flower, like a leaf, that lies under and supports the petals (= the delicate coloured parts that make up the head of the flower). Each flower has a ring of sepals called a calyx. Word Origin early 19th cent.: from French sépale, modern Latin sepalum, from Greek skepē ‘covering’, influenced by French pétale ‘petal’.
See the Oxford Advanced American Dictionary entry: sepal