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concavity (n.)
[concavity 词源字典]
c. 1400, from Old French
concavité
"hollow, concavity" (14c.) or directly from Latin
concavitatem
(nominative
concavitas
), from Latin
concavus
"hollow" (see
concave
).
[concavity etymology, concavity origin, 英语词源]
[concavity 词源字典]