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

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n. Plural form of concave.

v. Third-person singular simple present indicative form of concave.

"Some are deceived by echoes, some by roaring of waters, or concaves and reverberation of air in the ground, hollow places and walls."

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