From The Collaborative International Dictionary of English v.0.44 [gcide]:
Donjon \Don"jon\ (d[u^]n"j[u^]n), noun [See {Dungeon}.] The chief tower, also called the {keep}; a massive tower in ancient castles, forming the strongest part of the fortifications. See Illust. of {Castle}.
From WordNet (r) 2.0 [wn]:
noun
1: the main tower within the walls of a medieval castle or fortress [syn: {keep}, {dungeon}]
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