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Photo of a concave coin slot

Photo by Greg Scales

Attribution-Sharealike

Cis forConcave

A surface is concave if it curves inwards, forming a hollow. The coin slot in the picture is concave. The opposite of concave is convex.

Concave rhymes with ...

Agave, Engrave, Grave, Knave, Misbehave, Wave (motion) ... see all