GNU Collaborative International Dictionary of English

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1.       
   Portass (?), 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.
   
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   By God and by this porthors I you swear. Chaucer.
   
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