Donjon
DONJON (from a Late Lat. accusative form domnionem, connected with domnus or dominus, a lord), the French term for the keep of a medieval castle, used now in distinction to "dungeon" (q.v.), the prison, which is only an anglicized spelling (see also Keep).
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)
