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Latin word castellum comes from Proto-Indo-European *kes-, Proto-Indo-European *kat-
*kes- (Proto-Indo-European)
*kat- (Proto-Indo-European)
castrum (Latin)
(chiefly plural) camp, especially a military camp. Castle, fort.
castellum (Latin)
(figuratively) a shelter, stronghold, defence, refuge. A structure in which the water of an aqueduct is collected, to be distributed by pipes or channels in different directions; a reservoir. Castle, fort, citadel, fortress, stronghold.