concave

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concave

 [kon´kāv]
rounded and somewhat depressed or hollowed out.

con·cave

(kon-kāv'),
Having a depressed or hollowed surface.
[L. concavus, arched or vaulted]

con·cave

(kon'kāv)
Having a depressed or hollowed surface.
[L. concavus, arched or vaulted]

concave 

Pertaining to a surface shaped like the inside of a sphere. See diverging lens; concave mirror.