[hahy-droh-dahy-nam-iks, -di-]
noun (used with a singular verb)
the branch of fluid dynamics that deals with liquids, including hydrostatics and hydrokinetics.
Also called hydromechanics.

hydro-1 + dynamics

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World English Dictionary
hydrodynamics (ˌhaɪdrəʊdaɪˈnæmɪks, -dɪ-)
1.  (functioning as singular) hydrokinetics See also hydrostatics Also called: hydromechanics the branch of science concerned with the mechanical properties of fluids, esp liquids
2.  another name for hydrokinetics

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American Heritage
Science Dictionary
hydrodynamics  [%PREMIUM_LINK%]     (hī'drō-dī-nām'ĭks)  Pronunciation Key 
The scientific study of the motion of fluids, especially noncompressible liquids, under the influence of internal and external forces. Hydrodynamics is a branch of fluid mechanics and has many applications in engineering. Compare aerodynamics, hydrostatics.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The topics ranged from compound interest to number theory, hydrodynamics and
But current models that invoke hydrodynamics and surface adhesion effects do
  not adequately address this situation.
In fact, it flows so freely that it approximates a perfect liquid, the kind
  governed by the standard laws of hydrodynamics.
Other projects reduced the area of the lake but have not altered the
  hydrodynamics as severely as these constrictions.
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