NOUN (2)

1. the mistress of a chateau or large country house;

2. a chain formerly worn at the waist by women; for carrying a purse or bunch of keys etc.;

The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

WordNet (r) 3.0 (2006):

chatelaine
    n 1: the mistress of a chateau or large country house
    2: a chain formerly worn at the waist by women; for carrying a
       purse or bunch of keys etc.

Moby Thesaurus II by Grady Ward, 1.0:

59 Moby Thesaurus words for "chatelaine":
   abbess, anklet, armlet, bangle, beads, bijou, bracelet, breastpin,
   brooch, captain, castellan, chain, chaplet, charm, chatelain,
   circle, commandant, commander, coronet, crown, dame, diadem,
   director, dowager, earring, executive, first lady, fob, gem,
   goodwife, governess, governor, great lady, homemaker, housewife,
   intendant, jewel, locket, madam, manager, master, matriarch,
   matron, mistress, mother superior, necklace, nose ring, pin,
   precious stone, rhinestone, ring, ruler, stickpin, stone, tiara,
   torque, wampum, wristband, wristlet