(Mathématiques) Polygone ŕ quatre angles.
ETYM French, from Latin quadrangulum; quattuor four + angulus an angle. Related to Four, and Angle a corner.
1. A plane figure having four angles, and consequently four sides; any figure having four angles.
2. A square or quadrangular space or inclosure, such a space or court surrounded by buildings, esp. such a court in a college or university.