| 词汇 | quadrant |
| 词根词缀 | 词源： late 14c., "a quarter of a day, six hours," from L. quadrantem (nom. quadrans) "fourth part," prop. prp. of quadrare "to make square," from quadrus "a square," from quattuor "four" (see four). Sense of "measuring instrument" is first recorded c.1400, so called because it forms a quarter circle. |
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