| 单词 | plough diamond |
| 释义 | > as lemmasplough diamond Π 1768 Wonders Nature & Art (ed. 2) VI. 12 Those [diamonds] used for cutting looking-glass, &c. are called plough diamonds, and are fitted into a kind of plane. 1819 P. Nicholson Archit. Dict. I. ii. 46/2 Plough diamonds have a square nut on the end of the socket, next the glass, which, on running the nut square on the side of the lath, keeps it in the cutting direction. < as lemmas |
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