prae·pos·tor noun orpre·pos·tor\prēˈpästə(r)\; alsoprae·pos·i·tororpre·pos·i·tor\-äzət-\ (-s) Etymology: Medieval Latin praepositor, praepostor, from Latin praepositus, praepostus (past participle of praeponere to put in front, put in charge of) + -or — more at preposition : a monitor at an English public school