This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Curved like the inner surface of a sphere.

n. A concave surface, structure, or line.

v. To make concave.

adj. curved like the inner surface of a sphere or bowl

n. A concave surface or curve.

n. The vault of the sky.

n. One of the celestial spheres of the Ptolemaic or geocentric model of the world.

n. An element of a curved grid used to separate desirable material from tailings or chaff in mining and harvesting.

n. An indentation running along the base of a surfboard, intended to increase lift.

n. An indented area on the top of a skateboard, providing a position for foot placement and increasing board strength.

v. To render concave, or increase the degree of concavity.

adj. Hollow and curved or rounded; vaulted; -- said of the interior of a curved surface or line, as of the curve of the of the inner surface of an eggshell, in opposition to convex.

adj. Hollow; void of contents.

n. A hollow; an arched vault; a cavity; a recess.

n. A curved sheath or breasting for a revolving cylinder or roll.

v. To make hollow or concave.

Curved or rounded in the manner of the circumference of a circle or the surface of a sphere when viewed from the center; presenting a hollow or incurvation; incurved; hence, bounded by such a line or surface: as, a concave mirror.

Hollow; empty.

n. A hollow; an arch or vault; a concavity.

n. Any inwardly curved portion of a machine: as, the concave of a thresher (the curved breast in which the cylinder works).

n. A concave mirror.

To make hollow.

n. The vault or arch of heaven: as, “the blue concave.”

n. A playing card so trimmed that it can be separated from others according to the purpose for which the pack was prepared.

adj. curving inward

"It flowed in a gentle concave from the road up the mountain, its farther boundary an unbroken line of timber."

bowl-shaped    recessed    plano-concave    umbilicate    cuplike    acetabular    boat-shaped    pouch-shaped    concavo-convex    saucer-shaped   

convex   

concaved    concaves    concaving   

concave brick    concave mirror    concave leaf    concave lens   

concaved    concaving    concavity    concavely    concaveness    concaver   

hollow    cavity    recess    hole   

Dave    Wave    aftershave    behave    brave    cave    crave    deprave    engrave    enslave   

convex    semicircular    elliptical    rectangular    concentric    upper    spherical    domed    rocky    conical