n. [ OF. porte-hors a kind of prayer book, so called from being portable; cf. LL. portiforium. ] A breviary; a prayer book. [ Written variously portace, portasse, portesse, portise, porthose, portos, portus, portuse, etc. ] [ Obs. ] Spenser. Camden. [ 1913 Webster ]

By God and by this porthors I you swear. Chaucer. [ 1913 Webster ]