quadrant

n. 四分之一圆, 象限, 象限仪
【医】 四分体, 象限

quad.rant

n.Abbr. quad.（名词）缩写 quad.
Mathematics
【数学】
A circular arc of 90=; one fourth of the circumference of a circle.
九十度弧；圆周的四分之一
The plane area bounded by such an arc and two perpendicular radii.
四分之一圆，扇形体：由九十度弧与两条垂直的半径围成的平面图形
Any of the four areas into which a plane is divided by the reference axes in a Cartesian coordinate system, designatedfirst, second, third, and fourth, counting counterclockwise from the area in which both coordinates are positive.
象限：在笛卡尔坐标系中，被坐标轴分开的平面中的四个区域的任一个，命名为第一，第二，第三 和 第四， 从此象限逆时针计算坐标为正数
A machine part or other mechanical device that is shaped like a quarter circle.
扇形体：形状似四分之一圆圈的机器零件或其他机械设备
An early instrument for measuring altitude of celestial bodies, consisting of a 90= graduated arc with a movable radius for measuring angles.
象限仪：用来测量天体纬度的一种早期工具，由一个有90度刻度的圆弧和一个用来测量角度的可移动的半径构成

来源：
Middle English [quarter of a day]
中古英语 [一天的四分之一]
from Latin quadr3ns quadrant- [a fourth part] * see k wetwer-
源自 拉丁语 quadr3ns quadrant- [第四部分] *参见 k wetwer-