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ravelin n. 三角堡 三角堡 Half-moon \Half"-moon`\ (-m[=oo]n`), n.
1. The moon at the quarters, when half its disk appears illuminated. [1913 Webster] 2. The shape of a half-moon; a crescent. [1913 Webster] See how in warlike muster they appear, In rhombs, and wedges, and half-moons, and wings. --Milton. [1913 Webster] 3. (Fort.) An outwork composed of two faces, forming a salient angle whose gorge resembles a half-moon; -- now called a {ravelin}. [1913 Webster] 4. (Zool.) A marine, sparoid, food fish of California ({C[ae]siosoma Californiense}). The body is ovate, blackish above, blue or gray below. Called also {medialuna}. [1913 Webster] Ravelin \Rave"lin\ (r[a^]v"l[i^]n; 277), n. [F.; cf. Sp. rebellin, It. revellino, rivellino; perhaps fr. L. re- again vallum wall.] (Fort.) A detached work with two embankments which make a salient angle. It is raised before the curtain on the counterscarp of the place. Formerly called {demilune} and {half-moon}. [1913 Webster]
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