concave
Pronunciation:
/ˈkɒŋkeɪv/noun
Definitions
A concave surface or curve.
The vault of the sky.
One of the celestial spheres of the Ptolemaic or geocentric model of the world.
Example: Aristotle makes [Fire] to move to the concave of the Moon. - Thomas Salusbury (1661).
An element of a curved grid used to separate desirable material from tailings or chaff in mining and harvesting.
verb
Definitions
To render concave, or increase the degree of concavity.
adjective
Definitions
Curved like the inner surface of a sphere or bowl
(of a polygon) not convex; having at least one internal angle greater than 180 degrees.
(of a real-valued function on the reals) satisfying the property that all segments connecting two points on the function's graph lie below the function.
Hollow; empty