Liddell-Scott-Jones

προστάς (prostas) an antechamber ^G:N-F

προστάς-στάς, άδος, ἡ,

(προστάςΐστημι) properly part between the two antae (or wall-ends) of a building, [Refs 1st c.BC+]

__II vestibule, porch, portico, [LXX+3rd c.BC+]

_{LSJ Scripture Refs: LXX.Judg.3.23}