单词 | quarter-hollow |
释义 | quarter-hollownoun A concave moulding that has an arc which is (approximately) a quarter circle; (also) an engraving tool used to make convex or concave mouldings (more fully quarter-hollow tool). OriginMid 19th century; earliest use found in Charles Holtzapffel (1806–1847), mechanical engineer and technical writer. |
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