Bastion

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bastion

[′bas·chən]
(geology)
A prominent aggregation of bedrock extending from the mouth of a hanging glacial trough and reaching well into the main glacial valley.

Bastion

A projecting portion of a fortification designed to defend the adjacent curtain wall; it typically approximates a semi-hexagon, with the two outer faces meeting at an acute angle, and two flanks abutting a curtain wall on each side.

Bastion

 

a pentagonal fortification erected at the corners of the fortress wall to fire at the area in front of or along the fortress wall or the moats in front of them. Bastions appeared for the first time in Italy at the end of the 15th century and in Russia in the 16th century, where they were called raskats until the 18th century. A fortress bastion in Russia and in other countries consisted of one or two earth ramparts for the placement of weapons: the first, or the main rampart, and the second, or cavalier, which was higher than the first. The front sides of the bastion were called faces; the sides, flanks; and the inner rear side was called the gorge. The parts of two neighboring bastions facing each other and the section of the barrier connecting them, called the curtain, formed the bastion front.

bastion

A defense work, round, rectangular, or polygonal in plan, projecting from the outer wall of a fortification, principally to defend the adjacent perimeter.
References in periodicals archive ?
Antonelli completed designs for the permanent fortifications of the port city, surrounding it with secure, bastioned walls.
Geoffrey Parker made his name in the seventies and eighties with his revision of Michael Roberts' "military revolution" thesis, arguing that this revolution was driven by technology--the cannon-proof bastioned fortress--rather than tactics.
At Antwerp, Paciotti designed a similar pentagonal bastioned fortress with an even larger encompassing wall, which was carried out by his assistant Bernardino Facciotto.