sepal
Concise Oxford English Dictionary © 2008 Oxford University Press:
sepal /ˈsɛp(ə)l, ˈsiːp(ə)l/
▶noun Botany each of the parts of the calyx of a flower, enclosing the petals and typically green and leaf-like.
– origin C19: from Fr. sépale, mod. L. sepalum, from Gk skepē ‘covering’, influenced by Fr. pétale ‘petal’.
'sepal' also found in these Oxford entries:

