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From The Collaborative International Dictionary of English v.0.48:
Wig \Wig\, n. [Abbreviation from periwig.] [1913 Webster] 1. A covering for the head, consisting of hair interwoven or united by a kind of network, either in imitation of the natural growth, or in abundant and flowing curls, worn to supply a deficiency of natural hair, or for ornament, or according to traditional usage, as a part of an official or professional dress, the latter especially in England by judges and barristers. [1913 Webster] 2. An old seal; -- so called by fishermen. [1913 Webster] Wig tree. (Bot.) See Smoke tree, under Smoke. [1913 Webster]