ravelin

n. V形棱堡

词形变化

ravelins 复数 ravelins

释义与例句

n.
  1. 1.

    An outwork. A fortification outside a castle used to split an attacking force; composed of two faces, forming a salient angle whose gorge resembles a half-moon

词源

From French ravelin, from Italian rivellino, of unclear origin: perhaps from Latin re- + vallum.

来源：wiktionary