Definition of "water-ballast" [water-ballast]

• See ballast, 1. (noun)

The Century Dictionary (Public Domain)

• "An instrument showed the water-ballast tanks filling to capacity now."
• "The water-ballast tank is situated immediately behind the pilot's seat and contains 14 gallons of water weighing 140 lbs. The armament consists of a Lewis gun and bombs."
• "Not for long did the young inventor endeavor to break his way out of the water-ballast tank by striking the heavy sides of it."