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单词 semi-concave
释义 semi-concave Obs.
[semi- 7 a.]
Applied to the half of a hollow cylinder bisected longitudinally. (See concave n. 1 b.)
1626Bacon Sylva §131 As the Enclosure, that is Round about and Entire, preserueth the Sound; So doth a Semi-Concaue.1734Builder's Dict. s.v. II. B 7, A Semi-Concave-Cylinder.
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