/ ɑːˈgaɪl; NAmE ˈɑːrgaɪl/ noun
[ U ] a knitted pattern of diamond shapes on a plain background, especially on a sweater or on socks
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WORD ORIGIN
1940s: from Argyll , a family name and a former county of Scotland. The pattern is based on the tartan of the Argyll branch of the Campbell clan.