English definition of Bastion

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Definition of bastion

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Bastion (n.) A work projecting outward from the main inclosure of a fortification, consisting of two faces and two flanks, and so constructed that it is able to defend by a flanking fire the adjacent curtain, or wall which extends from one bastion to another. Two adjacent bastions are connected by the curtain, which joins the flank of one with the adjacent flank of the other. The distance between the flanks of a bastion is called the gorge. A lunette is a detached bastion. See Ravelin..

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Cavalier :: Cavalier (n.) A work of more than ordinary height, rising from the level ground of a bastion, etc., and overlooking surrounding parts..

Demilune :: Demilune (n.) 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..

Crownwork :: Crownwork (n.) A work consisting of two or more bastioned fronts, with their outworks, covering an enceinte, a bridgehead, etc., and connected by wings with the main work or the river bank..

Moineau :: Moineau (n.) A small flat bastion, raised in the middle of an overlong curtain..

Salient :: Salient (v. i.) Projecting outwardly; as, a salient angle; -- opposed to reentering. See Illust. of Bastion..

Base :: Base (n.) The exterior side of the polygon, or that imaginary line which connects the salient angles of two adjacent bastions..

Capital :: Capital (a.) An imaginary line dividing a bastion, ravelin, or other work, into two equal parts..

Bastioned :: Bastioned (a.) Furnished with a bastion; having bastions.

Orillon :: Orillon (n.) A semicircular projection made at the shoulder of a bastion for the purpose of covering the retired flank, -- found in old fortresses..

Gorge :: Gorge (n.) The entrance into a bastion or other outwork of a fort; -- usually synonymous with rear. See Illust. of Bastion.

Tenaillon :: Tenaillon (n.) A work constructed on each side of the ravelins, to increase their strength, procure additional ground beyond the ditch, or cover the shoulders of the bastions..

Tenaille :: Tenaille (n.) An outwork in the main ditch, in front of the curtain, between two bastions. See Illust. of Ravelin..

Bulwark :: Bulwark (n.) A rampart; a fortification; a bastion or outwork.

Curtain :: Curtain (n.) That part of the rampart and parapet which is between two bastions or two gates. See Illustrations of Ravelin and Bastion.

Shoulder :: Shoulder (n.) The angle of a bastion included between the face and flank. See Illust. of Bastion.

Counterguard :: Counterguard (n.) A low outwork before a bastion or ravelin, consisting of two lines of rampart parallel to the faces of the bastion, and protecting them from a breaching fire..

Retrench :: Retrench (v. t.) To furnish with a retrenchment; as, to retrench bastions..

Roundel :: Roundel (a.) A bastion of a circular form.

Surfaced :: Surface (n.) That part of the side which is terminated by the flank prolonged, and the angle of the nearest bastion..

Lunette :: Lunette (n.) A fieldwork consisting of two faces, forming a salient angle, and two parallel flanks. See Bastion..