Definitions for hairpieceˈhɛərˌpis
Random House Webster's College Dictionary
a covering of false hair, as a toupee or fall, for concealing baldness or supplementing the existing hair.
Origin of hairpiece:
hairpiece, false hair, postiche(noun)
a covering or bunch of human or artificial hair used for disguise or adornment
A false substitute for a person's hair; a toupee or wig.