[ rɪ'vɛtm(ə)nt ]
■ noun
1》 a retaining wall or facing of masonry, supporting or protecting a rampart, wall, etc.
2》 a barricade of earth or sandbags providing protection from blast or to prevent aircraft from overrunning when landing.
Origin
C18: from Fr. revêtement , from revêtir (see revet ).