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comparative more concave, superlative most concave
Curved like the inner surface of a sphere or bowl. examples
(geometry, not comparable, of a polygon) Not convex; having at least one internal angle greater than 180 degrees. examples
(functional analysis, not comparable, 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. examples
Hollow; empty. quotations examples
as concave […] as a worm-eaten nut
c. 1598–1600 (date written), William Shakespeare, “As You Like It”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act III, scene iv]
plural concaves
A concave surface or curve. examples
The vault of the sky. examples
One of the celestial spheres of the Ptolemaic or geocentric model of the world. examples
(manufacturing) An element of a curved grid used to separate desirable material from tailings or chaff in mining and harvesting. examples
(surfing) An indentation running along the base of a surfboard, intended to increase lift. examples
(skateboarding) An indented area on the top of a skateboard, providing a position for foot placement and increasing board strength. examples
(gambling) A playing card made concave for use in cheating. examples
third-person singular simple present concaves, present participle concaving, simple past and past participle concaved
To render concave, or increase the degree of concavity. examples