/shat"l ayn'/ ; Fr. /shahteu len"/ , n. , pl. chatelaines /shat"l aynz'/ ; Fr. /shahteu len"/ .
1. the mistress of a castle.
2. the mistress of an elegant or fashionable household.
3. a hooklike clasp or a chain for suspending keys, trinkets, scissors, a watch, etc., worn at the waist by women.
4. a woman's lapel ornament resembling this.
[ 1835-45; châtelaine. See CHATELAIN ]