concave
US /ˈkɑːn.keɪv/
UK /ˈkɑːn.keɪv/
1.
مقعر
having an outline or surface that curves inward like the interior of a circle or sphere
:
•
The spoon has a concave shape.
الملعقة لها شكل مقعر.
•
The lens of the telescope is concave.
عدسة التلسكوب مقعرة.