midmain🔊nounEtymology From mid- + main.1Archaic, Poetic The middle part of the sea.The shore his harbour , but the mid-main swum.c. 1610s, Homer (attributed), translated by George Chapman, The Crowne of all Homers Workes: Batrachomyomachia, or the Battaile of Frogs and Mise […], published 1624: