fore-bay|ˈfɔəbeɪ| [f. fore- prefix + bay n.3] a.Naut. b.Hydraulics. (seequots.) 1867Smyth Sailor's Word-bk., Fore-bay..the galley or sick-bay.1874Knight Dict.Mech., Forebay, a reservoir or conductor between a mill-race and a waterwheel. The discharging end of a head or mill-race.