Synset

defensive structure consisting of walls or mounds built around a stronghold to strengthen it
<noun.artifact> freq. cnt.: 1 freq. cnt.: 1

lexical pointers

derivationally related form

semantic pointers

hyponym

bastion bunker, dugout castle defilade intrenchment, entrenchment escarpment, escarp, scarp, protective embankment fieldwork lunette palisade breastwork, parapet redoubt stockade

hypernym

defensive structure, defense, defence

instance hyponym

Maginot Line Siegfried line

part meronym

rampart, bulwark, wall