Meaning of hydropneumatization

hy•dro•pneu•ma•ti•za•tion

Pronunciation: (hī"dru-n"mu-tu-zā'shun, -ny"-), [key]
— n.
  1. utilization of air pressure in the housing of a water turbine to keep the level of water that has been used from rising to interfere with the rotor blades.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.