Cyclopedia of Biblical, Theological and Ecclesiastical Literature
(κατάλυμα a lodging-place, i.e. properly inn, as rendered in Luke 2:7; hence any room of entertainment, and so used by the Sept. at 1 Samuel 9:22; Nehemiah 3:5; Ezekiel 40:44), the ὑπερῷον, canaculum, or spare apartment in an Oriental dwelling (Mark 14:14; Luke 22:11). (See HOUSE). At the public festivals these may naturally be supposed to have been placed at the service of strangers attending Jerusalem for that purpose.
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McClintock, John. Strong, James. Entry for 'Guest-Chamber'. Cyclopedia of Biblical, Theological and Ecclesiastical Literature. https://www.studylight.org/encyclopedias/eng/tce/g/guest-chamber.html. Harper & Brothers. New York. 1870.