[f. FORE- pref. + BAY sb.3] a. Naut. b. Hydraulics. (see quots.)

1

1867.  Smyth, Sailor’s Word-bk., Fore-bay.… The galley or sick-bay.

2

1874.  Knight, Dict. Mech., I. 904/2. Fore-bay. (Hydraulics.) A reservoir or conductor between a mill-race and a water-wheel. The discharging-end of a head or mill-race.

3