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concave (adj.)
[concave 词源字典]
early 15c., from Old French
concave
(14c.) or directly from Latin
concavus
"hollow, arched, vaulted, curved," from
com-
, intensive prefix (see
com-
), +
cavus
"hollow" (see
cave
(n.)).
[concave etymology, concave origin, 英语词源]