quadrangle (n.)

late 14c., from Old French quadrangle (13c.) and directly from Late Latin quadrangulum "four-sided figure," noun use of neuter of Latin adjective quadrangulus "having four quarters," from Latin quattuor "four" (from PIE root *kwetwer- "four") + angulus "angle" (see angle (n.)). Meaning "four-sided court between buildings" is from 1590s.