| 单词 | quadrant |
| 释义 | Word Frequency quadrant(ˈkwɒdrənt) noun 1. geometry a. a quarter of the circumference of a circle b. the area enclosed by two perpendicular radii of a circle and its circumference c. any of the four sections into which a plane is divided by two coordinate axes 2. a piece of a mechanism in the form of a quarter circle, esp one used as a cam or a gear sector 3. an instrument formerly used in astronomy and navigation for measuring the altitudes of stars, consisting of a graduated arc of 90° and a sighting mechanism attached to a movable arm Derived forms quadrantal (kwɒˈdræntəl) adjective Word origin C14: from Latin quadrāns a quarter |
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