adjective. Concave on both sides or surfaces.

Hollow or concave on both sides; doubly concave, as a lens. See lens.

adjective. Concave on both sides.

adjective. Having both sides concave.

adjective. concave on both sides

"Real red blood cells owe their astonishing agility to their "biconcave" or tyre-like shape, and to get the same kind of synthetic particles, Samir Mitragotri and his team got their inspiration from the way real red blood cells acquire their final shape in the body."

biconvex  

concave  

32-33  adhesive-backed  black-stained  brasero  cartilaginous  

concave  concavo-concave