| 单词 | optic square |
| 释义 | > as lemmasoptic square ΘΚΠ the world > the earth > earth sciences > geography > map-making > surveying > [noun] > surveying instruments > for laying off lines at right angles optic square1809 optical square1853 1809 Farmer's Mag. 10 489 By means of the optic square..a right-lined figure of any size can be measured with the utmost accuracy. < as lemmas |
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