a pattern of crossed lines and squares, used especially on cloth SYN tartan British English
a plaid shirt
Longman Dictionary of Contemporary English
plaid
plaid /plæd/ BrE AmE noun
[Date: 1500-1600; Language: Scottish Gaelic; Origin: plaide]
1. [uncountable] a pattern of crossed lines and squares, used especially on cloth SYN tartan British English:
a plaid shirt
2. [countable] a piece of plaid cloth worn over the shoulder and across the chest by people from Scotland as part of their ↑national costume
Oxford Advanced Learner's Dictionary
plaid
plaid [plaid plaids] [plæd] [plæd] noun
1. uncountable a type of thick cloth with a pattern of lines and squares of different colours and widths, especially a tartan pattern
2. countable a long piece of plaid made of wool, worn over the shoulders as part of the Scottish national dress
Word Origin:
early 16th cent.: from Scottish Gaelic plaide ‘blanket’, of unknown ultimate origin.
Culture:
tartan
Tartan is a traditional woollen cloth from Scotland that has patterns of squares and lines woven in various colours. Patterns depended originally on dyes available from local plants, so each area developed its own tartan. Tartans were not at first associated with a particular clan. From the late 18th century, Scottish regiments wore different tartans as an identifying feature, and the design of an individual tartan for each clan followed soon afterwards. The most famous tartans include ‘Black Watch’, the tartan of the Royal Highland Regiment, which is black and dark green, and ‘Royal Stuart’, the mainly red tartan of the royal family.
Scotsmen may wear a kilt (= a man’s skirt with pleats that reaches to the knees) and sometimes a plaid (= cloak), or simply a tie, in their clan’s tartan. Apart from those who work in the tourist industry, few Scots wear tartan as part of their ordinary clothing. Men wear kilts when taking part in Scottish dancing displays or for formal occasions such as weddings.
Many Scots consider it wrong to wear the tartan of a clan to which they do not belong, but this has not prevented tartan, or tartan-like patterns, becoming fashionable in Britain and abroad. For some people tartan has romantic associations with Scotland’s history and its wild and beautiful countryside. Women’s kilts, skirts and dresses, as well as scarves, bags, travelling rugs, and many other articles, are made in tartan patterns. Goods sold to tourists, such as tins of shortbread biscuits, are decorated with tartan patterns to indicate their origin.
Cambridge Advanced Learner's Dictionary
Cambridge Advanced Learner's Dictionary - 4th Edition
plaid / plæd / noun [ U ]
mainly US for tartan
Collins Advanced Learner’s English Dictionary
plaid
[plæ_d]
plaids
1) N-MASS: oft N n Plaid is material with a check design on it. Plaid is also the design itself.
Eddie wore blue jeans and a plaid shirt.
2) N-COUNT A plaid is a long piece of tartan material that is worn over the shoulder as part of the Scottish Highland traditional dress.
Merriam-Webster's Advanced Learner's Dictionary
plaid
plaid /ˈplæd/ noun, pl plaids
1 [noncount] : a pattern on cloth of stripes with different widths that cross each other to form squares - often used before another noun
• a plaid pattern
• a plaid shirt
- see color picture
2 plaids [plural] US : clothes with plaid patterns
• She likes to wear plaids.
3 [count] : a woolen cloth with a plaid pattern that is worn over the shoulder as part of the Scottish national costume