The noun is an unadapted borrowing from Scots tartan, from Old Scots tartane, tertane, probably from Old French tertaine, tiretaine (“cloth of wool mixed with cotton or linen”), probably from tiret (“kind of precious cloth”) + -aine modelled after futaine (“woven cloth made from cotton mixed with linen or silk”). Tiret is derived from tire (“kind of silk cloth”), from Medieval Latin tyrium (“cloth dyed with Tyrian purple”), a noun use of Latin tyrium, an inflection of tyrius (“of Tyre, Tyrian”), from Latin Tyrus (“Phoenician city of Tyre (in modern Lebanon)”) (from Ancient Greek Τῠ́ρος (Tŭ́ros), from Phoenician 𐤑𐤓 (ṣr)) + -ius (suffix forming adjectives). Another suggestion is that the Scots noun is from Middle English tartaryn (“rich cloth (probably silk) imported from the East, probably from China through Tartary”), from Old French (drap) tartarin (literally “cloth of Tartary”), from Medieval Latin Tartarīnus (“of Tartary or the Tatars”), from Latin Tartarus, Tatarus (“Tatar person”) + -īnus (suffix meaning ‘of or pertaining to’ forming adjectives). However, the Oxford English Dictionary notes that tartarin referred to a more expensive fabric. Noun etymology 1, noun sense 2.2 (“type of fly used in fly fishing”) may refer to its use in Scotland: see the 1837 quotation. Etymology 1, noun sense 2.3 (“young person who is a member of a Protestant gang in Northern Ireland”) is from the fact that they were traditionally supporters of Rangers Football Club based in Glasgow, Scotland. The adjective is from an attributive use of the noun, while the verb is also derived from the noun.

plaid • Scotch plaid