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Etymology tree Proto-West Germanic *klainī Old English clǣne Middle English clene English clean From Middle English clene, from Old English clāne, clǣne (“clean; pure; clear”), from Proto-West Germanic *klainī (“dainty, fine, small; clean”), perhaps from Proto-Indo-European *glēy- (“gleaming”), from Proto-Indo-European *gel- (“to gleam”). Cognates Cognate with Alemannic German chlei, chli, chlii, chly, klei (“small”), Bavarian gloa, kla, klaa, kloa, kloan (“small; young; insignificant”), Central Franconian and Low German kleen (“small”), Cimbrian khlòan, khlumma (“small”), Dutch and German klein (“small”), Limburgish klein, kléïn (“small”), Luxembourgish kleng (“small”), Mòcheno khloa'n (“small”), Vilamovian klin (“small”), Yiddish קליין (kleyn, “small”), Danish klejn (“delicate, tiny”), Faroese klænur (“slight, slim, thin”), Icelandic klénn (“feeble, poor; indisposed; short; lame; good, pretty, snug”), Norwegian Bokmål klein, klen (“slender; sick; feeble; bad, poor, weak; inept”), Swedish klen (“weak”).