jailer n. + Add to list US //ˈdʒeɪɫɝ// UK //dʒˈeɪlɐ// jail·er SynonymsEtymology Synonyms jailorscrewturnkeyOriginOFRjaiolier→MEgayoler→ENjailer Inherited from Middle English gayoler, gayler, jayler, from Old French jaiolier, gaiolier, from jaiole. By surface analysis, jail + -er.