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  1. Oxford Dictionary

    ravelin

    • IPA[ˈravəlɪn]

    英式

    • n.
      an outwork of fortifications, with two faces forming a salient angle, constructed beyond the main ditch and in front of the curtain.

    • noun: ravelin, plural noun: ravelins

    • 更多解釋

    ravelin

    • IPA[ˈravlən]

    美式

    • n.
      an outwork of fortifications, with two faces forming a salient angle, constructed beyond the ...

    Oxford American Dictionary