| 单词 | quadrant |
| 释义 | quadrant n. 1. a quarter of a circle's circumference. 2. a plane figure enclosed by two radii of a circle at right angles and the arc cut off by them. 3. a quarter of a sphere etc. 4. a a thing, esp. a graduated strip of metal, shaped like a quarter-circle. b an instrument graduated (esp. through an arc of 90�� for taking angular measurements. Derivatives quadrantal adj. Etymology: ME f. L quadrans -antis quarter f. quattuor four |
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