διαστύλιον
From LSJ
οἵ γε καὶ ἐν τῷ παρόντι ἀντιπάλως μᾶλλον ἢ ὑποδεεστέρως τῷ ναυτικῷ ἀνθώρμουν → whose navy, even as it was, faced the Athenian more as an equal than as an inferior
English (LSJ)
[ῡ], τό, in Architecture,
A space between the columns, Lat. intercolumnium, Bito 54.3. 2 ἀνέστησε δ. δύο perh. a monument with three pillars, Keil-Premerstein Dritter Bericht No.107.