a chain formerly worn at the waist by women; for carrying a purse or bunch of keys etc.
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Chatelaine \Chat"e*laine\, n. [F. ch[^a]telaine the wife of a castellan, the mistress of a chateau, a chatelaine chain.] An ornamental hook, or brooch worn by a lady at her waist, and having a short chain or chains attached for a watch, keys, trinkets, etc. Also used adjectively; as, a chatelaine chain.