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1. (used with a sing. verb) The branch of science that deals with the dynamics of fluids, especially incompressible fluids, in motion.
2. (used with a pl. verb) The dynamics of fluids in motion.
hy′dro·dy·nam′i·cist (-ĭ-sĭst) n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
a specialist in hydrodynamics
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014