名詞 quadrant:

1. a quarter of the circumference of a circle
   同義詞：right angle
2. a quarter of the circumference of a circle
   同義詞：quarter-circle
3. any of the four areas into which a plane is divided by two orthogonal coordinate axes
4. the area enclosed by two perpendicular radii of a circle
5. a measuring instrument for measuring altitude of heavenly bodies

quad.rant

n.Abbr. quad.（名詞）縮寫 quad.
Mathematics
【數(shù)學(xué)】
A circular arc of 90=; one fourth of the circumference of a circle.
九十度??；圓周的四分之一
The plane area bounded by such an arc and two perpendicular radii.
四分之一圓，扇形體：由九十度弧與兩條垂直的半徑圍成的平面圖形
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：在笛卡爾坐標(biāo)系中，被坐標(biāo)軸分開的平面中的四個(gè)區(qū)域的任一個(gè)，命名為第一，第二，第三 和 第四， 從此象限逆時(shí)針計(jì)算坐標(biāo)為正數(shù)
A machine part or other mechanical device that is shaped like a quarter circle.
扇形體：形狀似四分之一圓圈的機(jī)器零件或其他機(jī)械設(shè)備
An early instrument for measuring altitude of celestial bodies, consisting of a 90= graduated arc with a movable radius for measuring angles.
象限儀：用來測(cè)量天體緯度的一種早期工具，由一個(gè)有90度刻度的圓弧和一個(gè)用來測(cè)量角度的可移動(dòng)的半徑構(gòu)成

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