1. convexo-concave

adjective. convex on one side and concave on the other with the convexity being greater than the concavity.

Rhymes with Concave Polygon

2. concavo-concave

adjective. concave on both sides.

3. concave

adjective. ['kɑːnˈkeɪv, ˈkɑːnkeɪv'] curving inward.

4. polygon

noun. ['ˈpɑːlɪˌgɑːn'] a closed plane figure bounded by straight sides.