From Middle English rail, rayl, *reȝel, *reȝol (found in reȝolsticke), partly from Old English regol ("a ruler, straight bar") and partly from Old French reille; both from Latin regula ("rule, bar"), from regere; see regular.
From French râle, Old French rasle. Compare Medieval Latin rallus. Named from its harsh cry, Vulgar Latin *rasculum, from Latin rādō ("to scrape").
From Middle French railler.
From Middle English rail, reil, from Old English hræġl. Cognate with Old Frisian hreil, reil, Old Saxon hregil, Old High German hregil.
Probably from Anglo-Norman raier, Middle French raier.
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