Quadrant

['kwɒdr(ə)nt] or ['kwɑdrənt]

解释:

(noun.) a measuring instrument for measuring altitude of heavenly bodies.

(noun.) the area enclosed by two perpendicular radii of a circle.

(noun.) any of the four areas into which a plane is divided by two orthogonal coordinate axes.

(noun.) a quarter of the circumference of a circle.

休伯特校对--From WordNet

解释:

(n.) The fourth part; the quarter.

(n.) The quarter of a circle, or of the circumference of a circle, an arc of 90¡, or one subtending a right angle at the center.

(n.) One of the four parts into which a plane is divided by the coordinate axes. The upper right-hand part is the first quadrant; the upper left-hand part the second; the lower left-hand part the third; and the lower right-hand part the fourth quadrant.

(n.) An instrument for measuring altitudes, variously constructed and mounted for different specific uses in astronomy, surveying, gunnery, etc., consisting commonly of a graduated arc of 90¡, with an index or vernier, and either plain or telescopic sights, and usually having a plumb line or spirit level for fixing the vertical or horizontal direction.

尤金伲亚整理

解释:

n. (geom.) the fourth part of a circle or an arc of 90? an instrument used in astronomy for the determination of angular measurements: an instrument of navigation for measuring the altitude of the sun.—adj. Quadrant′al pertaining to equal to or included in a quadrant.

哈维整理