lavalier

noun

1. an ornamental pendant, usually jeweled, worn on a chain around the neck.
2. lavaliere microphone.

n.kind of ornament that hangs around the neck, from French lavallière, a kind of tie, after Louise Françoise de La Baume Le Blanc de La Vallière, Duchesse de La Vallière (1644-1710), mistress of Louis XIV from 1661-1667. see lavalier.