(n.) A plane figure having many angles and many sides\; esp., one whose perimeter consists of more than four sides; any figure having many angles.

abatis advanced work arena bailey balistraria bank banquette barbed-wire entanglement barbican barnyard barricade barrier bartizan barton bastion battlement boundary box breastwork bulwark cage casemate cheval-de-frise cincture circling circumambience circumambiency circumcincture circumflexion circumjacence circumposition circumvallation close compound confine container containment contravallation coop corral cote counterscarp court courtyard crib croft curtain curtilage delimited field demibastion dike dog pound drawbridge earthwork embracement encincture encirclement enclave encompassment enfoldment entanglement envelopment environment escarp escarpment farmyard fence field fieldwork fold fortalice fortification girding girdling glacis ground hedge hell hutch inclusion involvement kraal limbo list loophole lunette machicolation manger mantelet merlon mound outwork paddock pale paling palisade parados parapet park pasture pen penfold pigpen pigsty pinfold place of confinement polygon portcullis postern gate pound purgatory quad quadrangle rail railing rampart ravelin redan redoubt rink run runway sally port scarp sconce square stall stockade stockyard sty surrounding tenaille theater toft vallation vallum wall work yard