quadrant
/ˈkwɒdrənt/noun
1- technical each of four quarters of a circle〈技〉四分之一圆周, 九十度弧。
1.1
- each of four parts of a plane, sphere, space, or body divided by two lines or planes at right angles（两条直线垂直相交划出的）四分之一平面; （两个平面垂直相交划出的）四分之一球体（或空间, 物体）：
the right upper quadrant of the kidney.
肾脏右上方的1/4.
1.2
- historical an instrument used for taking angular measurements of altitude in astronomy and navigation, typically consisting of a graduated quarter circle and a sighting mechanism〈史〉象限仪, 四分仪。
1.3
- a frame fixed to the head of a ship's rudder, to which the steering mechanism is attached扇形舵柄。
1.4
- a panel with slots through which a lever is moved to orient or otherwise control a mechanism直角换向器。
派生词
quadrantal
adjective词源
late Middle English (denoting the astronomical instrument)： from Latin quadrans, quadrant- 'quarter'， from quattuor 'four'.