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-
