concave
About 2.52 uses per million words.
Meaning
- adjective Curved like the inner surface of a sphere or bowl.
- adjective Not convex; having at least one internal angle greater than 180 degrees.
- adjective Satisfying the property that all segments connecting two points on the function's graph lie below the function.
- adjective Hollow; empty.
- noun A concave surface or curve.
- noun The vault of the sky.
- noun One of the celestial spheres of the Ptolemaic or geocentric model of the world.
Aristotle makes [Fire] to move to the concave of the Moon. - Thomas Salusbury (1661).
- noun An element of a curved grid used to separate desirable material from tailings or chaff in mining and harvesting.
Similar words
biconcave concavo-convex planoconcave indented bursiform recessed saclike acetabular cupular cupulate
Often followed by
mirror and side surface lens in or on to
Word family
concaves
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