English dictionary
concave
/k/A/n'k/eI/v/
Definitions, examples, synonyms and antonyms from WordNet 3.0.
adjective
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curving inward
Source: WordNet 3.0
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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 <i>convex</i>; as, a <i>concave</i> mirror; the <i>concave</i> arch of the sky.
Source: webster1913
noun
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A hollow; an arched vault; a cavity; a recess.
Source: webster1913
verb
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To make hollow or concave.
Source: webster1913