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Concavities

資料來源 : Webster's Revised Unabridged Dictionary (1913)

Concavity \Con*cav"i*ty\, n.; pl. {Concavities}. [L. concavitas:
   cf. F. concavit['e]. See {Concave}.]
   A concave surface, or the space bounded by it; the state of
   being concave.
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