פָּתִין, (פָּתָה) the principal or king-beam, common to two adjoining buildings, opp. to ראשים the cross-beams. Neg. XIII, 2 בית הבנוי ראש ופ׳ if a (twin-) house is built with cross-beam and king-beam common to both compartments.—[Tosef. Kel. B. Mets. VII, 8 פתין ed. Zuck., v. פֶּתִי.]