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demilune n. 半月形堡壘 半月形堡壘 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] Demilune \Dem"i*lune`\, n. [F. demi- lune.] 1. (Fort.) A work constructed beyond the main ditch of a fortress, and in front of the curtain between two bastions, intended to defend the curtain; a ravelin. See {Ravelin}. [1913 Webster] 2. (Physiol.) A crescentic mass of granular protoplasm present in the salivary glands. [1913 Webster] Note: Each crescent is made of polyhedral cells which under some circumstances are supposed to give rise to new salivary cells. [1913 Webster]
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