Sepal
/ˈsiːpl/
Definition 1 of 1
Pro Tip 1/3Plant Anatomy
Remember, 'sepal' is a botanical term; use it when discussing parts of a flower. 
During the dissection, we identified the sepal and the stigma.
Pro Tip 2/3Visual Description
Use 'sepal' to describe visually since it refers to a distinctive, usually green part of the flower. 
The sepals contrasted the bright red petals beautifully.
Pro Tip 3/3Protection Role
'Sepal' emphasizes the protective function it has for the budding flower. 
The plant's sepals shielded the young buds from the harsh wind.