chatelaine (n.)

1845, from French châtelaine "a female castellan; wife of a castellan; mistress of a castle or country house;" fem. of châtelain, from Old French chastelain "owner and lord of a castle, nobleman; keeper of a castle" (Modern French châtelaine), from chastel "castle," from Latin castellum "castle" (see castle (n.)).   In fashion, as a type of ornamental belt, from 1851; supposed to resemble a chain of keys.

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