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(ˈtæm əˌʃæn tər)

a round, flat cap of Scottish origin, usu. of wool, with a pompom at its center.
[1880–85; after the hero of Tam O'Shanter (1791), poem by Robert Burns]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
A firm of Tam-o-Shanter makers in Irvine, Ayrshire, were chosen to design and manufacture the beret.
That dandy master of themed musical events, Carl Davis, (like four orchestra members, sporting tam-o-shanter headgear, but notably no kilt) returning with folk singer/violinist Mairi Campbell, who graced the Phil''s New Year''s Eve celebrations.
And in this shabby little stadium in Nowhere, America, she was nattily attired in a sharp linen suit, a stylish tam-o-shanter cap, and dress shoes with stiletto heels.