Curved like the inner surface of a sphere or bowl.
Hollow; empty.
Satisfying the property that all segments connecting two points on the function's graph lie below the function.
Not convex; having at least one internal angle greater than 180 degrees.
To render concave, or increase the degree of concavity.
A playing card made concave for use in cheating.
One of the celestial spheres of the Ptolemaic or geocentric model of the world.
An indentation running along the base of a surfboard, intended to increase lift.
An element of a curved grid used to separate desirable material from tailings or chaff in mining and harvesting.
The vault of the sky.
An indented area on the top of a skateboard, providing a position for foot placement and increasing board strength.
A concave surface or curve.
Shaped like a crescent.
To form a crescent shape
To decorate with crescents.
A curved street, often presenting a continuous façade, as of row houses.
A representation of crescent used as a symbol of Islam.
The emblem of the waxing Moon with horns directed upward, when used in a coat of arms; often used as a mark of cadency to distinguish a second son and his descendants.
The figure of the moon as it appears between its first or last quarter and the new moon, with concave and convex edges terminating in points.
A curved pastry.
A crescent spanner.
Any of three orders of knighthood conferred upon foreigners to whom Turkey might be indebted for valuable services.
A crescentspot butterfly.