Hypertext Webster Gateway: "Donjon"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Donjon \Don"jon\, n. [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) 1.7 (wn)
donjon
n : the main tower within the walls of a medieval castle or
fortress [syn: {keep}, {dungeon}]
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