castellum

[ ka-stel-uhm ]

noun,plural cas·tel·li [ka-stel-ahy]. /kæˈstɛl aɪ/. Archaeology.
  1. a small isolated fortress, or one of a series of such fortresses, of the ancient Romans.

Origin of castellum

1
<Latin: fortified settlement, fortress <*casterlom<*castṛlom<*castrelom, equivalent to castr(a) (neuter plural) fortified camp + *-elom diminutive suffix; see -ule, -elle

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