concave
US /ˈkɑːn.keɪv/
UK /ˈkɑːn.keɪv/
1.
concave
having an outline or surface that curves inward like the interior of a circle or sphere
:
•
The spoon has a concave shape.
La cuillère a une forme concave.
•
The lens of the telescope is concave.
La lentille du télescope est concave.