flu'id drive'

a power coupling for permitting a smooth start in any gear, consisting of two vaned rotors in a sealed casing filled with oil, such that one rotor, driven by the engine, moves the oil to drive the other rotor, which in turn drives the transmission.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

fluid dramfluid dynamics
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