As an adjective wig
is (aviation|nautical) wing-in-ground.
As a noun headdress is
a decorative covering or ornament worn on the head.
A head of real or synthetic hair worn on the head to disguise baldness; for cultural or religious reasons; for fashion; or by actors to help them better resemble the character they are portraying.
(dated, among fishermen) An old seal.
* toupee, toupe
* bald wig
* fright wig
* wig out
To put on a wig; to provide with a wig (especially of an actor etc.).
(colloquial) To upbraid, reprimand.
(colloquial) To become very excitable or emotional; to lose control of one's emotions.
* (an covering or ornament worn on the head) headgear