Etymology
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chatelaine (n.)

1845, "mistress of a castle or household," 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; it is supposed to resemble a chain of keys such as a chatelaine would wear.

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Definitions of chatelaine

chatelaine (n.)
the mistress of a chateau or large country house;
chatelaine (n.)
a chain formerly worn at the waist by women; for carrying a purse or bunch of keys etc.;
From wordnet.princeton.edu