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 for Tower bastion
From The Collaborative International Dictionary of English v.0.48 :

  Tower \Tow"er\, n. [OE. tour,tor,tur, F. tour, L. turris; akin
     to Gr. ?; cf. W. twr a tower, Ir. tor a castle, Gael. torr a
     tower, castle. Cf. Tor, Turret.]
     1. (Arch.)
        (a) A mass of building standing alone and insulated,
            usually higher than its diameter, but when of great
            size not always of that proportion.
        (b) A projection from a line of wall, as a fortification,
            for purposes of defense, as a flanker, either or the
            same height as the curtain wall or higher.
        (c) A structure appended to a larger edifice for a special
            purpose, as for a belfry, and then usually high in
            proportion to its width and to the height of the rest
            of the edifice; as, a church tower.
            [1913 Webster]
     2. A citadel; a fortress; hence, a defense.
        [1913 Webster]
              Thou hast been a shelter for me, and a strong tower
              from the enemy.                       --Ps. lxi. 3.
        [1913 Webster]
     3. A headdress of a high or towerlike form, fashionable about
        the end of the seventeenth century and until 1715; also,
        any high headdress.
        [1913 Webster]
              Lay trains of amorous intrigues
              In towers, and curls, and periwigs.   --Hudibras.
        [1913 Webster]
     4. High flight; elevation. [Obs.] --Johnson.
        [1913 Webster]
     Gay Lussac's tower (Chem.), a large tower or chamber used
        in the sulphuric acid process, to absorb (by means of
        concentrated acid) the spent nitrous fumes that they may
        be returned to the Glover's tower to be reemployed. See
        Sulphuric acid, under Sulphuric, and Glover's tower,
     Glover's tower (Chem.), a large tower or chamber used in
        the manufacture of sulphuric acid, to condense the crude
        acid and to deliver concentrated acid charged with nitrous
        fumes. These fumes, as a catalytic, effect the conversion
        of sulphurous to sulphuric acid. See Sulphuric acid,
        under Sulphuric, and Gay Lussac's tower, above.
     Round tower. See under Round, a.
     Shot tower. See under Shot.
     Tower bastion (Fort.), a bastion of masonry, often with
        chambers beneath, built at an angle of the interior
        polygon of some works.
     Tower mustard (Bot.), the cruciferous plant Arabis
     Tower of London, a collection of buildings in the eastern
        part of London, formerly containing a state prison, and
        now used as an arsenal and repository of various objects
        of public interest.
        [1913 Webster]

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