Fort

Kastell (from the Latin castellum 'castle, fortress'):

generally a fortified place, a fortification or a fortified military camp, see castle
an ancient fortification, see Roman military camp
a special type of castle, the fort castle
a coat of arms figure in heraldry, see fort (heraldry)
the defensive structure of a ship, see ship fort

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Wiktionary: Kastell - explanations of meanings, word origins, synonyms, translations