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Meaning of friction head

fric'tion head"

Pronunciation: [key]
  1. (in a hydraulic system) the part of a head of water or of another liquid that represents the energy that the system dissipates through friction with the sides of conduits or channels and through heating from turbulent flow.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.