διήρης

A. double, διῆρες ὑπερῷον upper story, upper chamber, Pl.Com. 112; μελάθρων διῆρες ἔσχατον (sc. ὑπερῷον) E. Ph. 90, cf. Plu. 2.77e.

II. ἡ δ. (sc. ναῦς) bireme, ship with two banks of oars, Poll. 1.82.