Learn how to say Concave correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word concave:
(physics) having one or two surfaces curved or ground in the shape of a section of the interior of a sphere, paraboloid, etc ⇒ a concave lens
(mathematics) (of a polygon) containing an interior angle greater than 180°
an obsolete word for hollow
(transitive) to make concave
C15: from Latin concavus arched, from cavus hollow