1) Curved 2) Curved backward or inward 3) Curving 4) Recurved 1) Curved 2) Curving 3) Recurved 
• (a.) Recurved. • (v. t.) To bend or curve back; to recurve.
A shape that from the bottom starts wide then thins out becomes wide and then again thins out to the distal end. A fish shaped profile. A basal edge that has two smooth indents with a central excurvate bulge.
Re·cur'vate adjective [ Latin recurvatus , past participle of recurvare . See Re- , and Curvate .] (Botany) Recurved.