wig - hairpiece covering the head and made of real or synthetic hair. grizzle - a grey wig. false hair, hairpiece, postiche - a covering or bunch of human or artificial hair used for disguise or adornment. horsehair wig - a wig made of horsehair; the English judiciary wear their traditional horsehair wigs. periwig, peruke - a wig for men that was fashionable in the 17th and 18th centuries.