The Collaborative International Dictionary of English v.0.48:
Pince-nez \Pince`-nez"\, n. [F. pincer to pinch + nez nose.] Eyeglasses kept on the nose by a spring. [1913 Webster]WordNet (r) 3.0 (2006):
pince-nez n 1: spectacles clipped to the nose by a spring