[plaid] n [ScGael plaide] (1512) 1: a rectangular length of tartan worn over the left shoulder as part of the Scottish national costume
2. a: a twilled woolen fabric with a tartan pattern b: a fabric with a pattern of tartan or an imitation of tartan 3 a: tartan 1 b: a pattern of unevenly spaced repeated stripes crossing at righ t angles -- plaid adj -- plaid.ed adj