What does "cyma reversa" mean?

A cyma convex in its upper part, and concave in its lower part.

How do you pronounce "cyma reversa"?

Pronounced //ˈsaɪmə ɹɪˈvɜːsə//.

/ˈsaɪmə ɹɪˈvɜːsə/ noun

noun ·Rare ·Advanced level

Noun

1
A cyma convex in its upper part, and concave in its lower part.
2
a molding that (in section) has the shape of an S with the convex part above and the concave part below wordnet

cyma + Latin reversa (“returned”)