From The Collaborative International Dictionary of English v.0.44 [gcide]:
Thermodynamics \Ther'mo*dy*nam"ics\, noun The science which treats of the mechanical action or relations of heat.
From WordNet (r) 2.0 [wn]:
noun
1: the branch of physics concerned with the conversion of different forms of energy
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
59 Moby Thesaurus words for "thermodynamics": Newtonian physics, acoustics, aerodynamics, aerophysics, applied physics, astrophysics, barodynamics, basic conductor physics, biodynamics, biophysics, calorimetry, chemical physics, cryogenics, crystallography, cytophysics, dynamics, electron physics, electronics, electrophysics, fluid dynamics, geodynamics, geophysics, hydrodynamics, kinematics, kinesiology, kinetics, macrophysics, magnetohydrodynamics, mathematical physics, mechanics, medicophysics, microphysics, myodynamics, natural philosophy, natural science, nuclear physics, optics, philosophy, physic, physical chemistry, physical science, physicochemistry, physicomathematics, physics, psychophysics, pyrotechnic, pyrotechnics, pyrotechny, radiation physics, radionics, solar physics, solid-state physics, statics, stereophysics, theoretical physics, thermochemistry, thermotics, zoodynamics, zoophysics
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