The Collaborative International Dictionary of English v.0.48:
Peignoir \Pei`gnoir"\, n. [F., fr. peigner to comb, L. pectinare. See Pectinate.] A woman's loose dressing sack; hence, a loose morning gown or wrapper. [Webster 1913 Suppl.]WordNet (r) 3.0 (2006):
peignoir n 1: a loose dressing gown for women [syn: negligee, neglige, peignoir, wrapper, housecoat]