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Architecture the main tower within the walls of a medieval castle or fortress
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
Inner tower of a castle.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
The stronghold of a medieval castle, usually in the form of a massive tower, and a place of residence, esp. in times of siege.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.