عَرْسٌ

A wall which is placed between the two [main lateral] walls of the winter-chamber, not reaching to the further end thereof, (S, O, K, TA,) then the beam is laid from the inner extremity of that wall to the further end of the chamber, (TA,) and it is roofed over, (S, O, K, TA,) i. e. the whole chamber is roofed over: what is between the two walls [above mentioned] is [called] a سَهْوَة [q. v.], and what is beneath the beam [apparently with what is screened by the middle wall from the portion (of the chamber) in which is the entrance] is the مُِخْدَع: (TA:) this is done for the sake of more warmth, and only in cold countries: (S, O, K, TA:) and it is called in Pers. بيجه [correctly PيJه]: (S, TA:) and عَرْصٌ is [said to be] a dialect var. thereof. (TA.)