Concavity

(noun.) the property possessed by a concave shape.

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• Formerly augers and similar boring tools had merely a curved sharpened end and a concavity to hold the chips, and the whole tool had to be withdrawn to empty the chips. 威廉·亨利·杜利特. 世纪发明.
• With its concavity toward the southern sky it was closely comparable, though reverse, to the celestial meridian throughout its length from horizon to zenith. 李贝. 西洋科学史.

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