ravelin
n. முற்றுகையிட்ட அரண்முன் உள்ள இருமுக அகழி.
Rave"lin, n. Etym: [F.; cf. Sp. rebellin, It. revellino, rivellino; perhaps fr. L. re- again + vallum wall.] (Fort.) Defn: A detached work with two embankments with make a salient angle. It is raised before the curtain on the counterscarp of the place. Formerly called demilune and half-moon.