jailer/ˈd͡ʒeɪlə(ɹ)/EtymologyInherited from Middle English gayoler, gayler, jayler, from Old French jaiolier, gaiolier, from jaiole. By surface analysis, jail + -er.jailer means One who enforces confinement in a jail or prison. Lexicurio rates it Rare gem — a strength score of 71 out of 100.nounOne who enforces confinement in a jail or prison.“Sometimes some of the ejected ministers preached to them privately, and now and then the jailer allowed Mr. H. to go out in the night to preach to them, and administer the Lord's Supper.”