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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From Scottish Gaelic caol (“narrow; thin; firth, narrows, strait, kyle; narrow part of something”) (genitive singular form caoil), from Old Irish coíl (“narrow, slender”), from Proto-Celtic *koilos (“thin”), from Proto-Indo-European *skey- (“to dissect; to split”).
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Classic usage
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