1. A mass of building standing alone and insulated, usually higher than its diameter, but when of great size not always of that proportion. 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.
3. A headdress of a high or towerlike form, fashionable about the end of the seventeenth century and until 1715; also, any high headdress. Lay trains of amorous intrigues In towers, and curls, and periwigs. (Hudibras)
(Science: botany) Tower mustard, the cruciferous plant Arabis perfoliata. 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.
Origin: 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.