■ noun technical
1》 each of four parts of a circle, plane, body, etc. divided by two lines or planes at right angles.
2》 historical an instrument for taking angular measurements, consisting of a graduated quarter circle and a sighting mechanism.
3》 a frame, typically in the form of a quarter circle, enclosing a steering mechanism or control lever.
Derivatives
~al adjective
Origin
ME: from L. quadrans , ~- 'quarter', from quattuor 'four'.