butterfly
Definitions
A nectar-feeding insect with two pairs of large, typically brightly colored wings that are covered in microscopic scales.
A swimming stroke performed on the breast in which the arms are thrown forward together out of the water and the legs perform a dolphin kick.
Examples
A colorful butterfly landed gently on the flower petal.
The butterfly emerged from its chrysalis after two weeks.
I felt a butterfly flutter in my stomach before the big presentation.