Definitions

1. adjective

Having petals that do not open, especially in the flowers of certain orchids and some species of the violet family.

“The apopetalous flowers bloomed in the spring, but remained closed to protect the delicate petals.”

2. adjective

Not opening or unfolding, especially in the case of petals or other parts of a flower.

“The apopetalous flowers of the orchid were a unique sight among the other blooms in the garden.”