1. zeroth law of thermodynamics the law that if two bodies are in thermal equilibrium with a third body then the first two bodies are in thermal equilibrium with each other
  2. third law of thermodynamics law stating that the entropy of a substance approaches zero as its temperature approaches absolute zero
  3. second law of thermodynamics a law stating that mechanical work can be derived from a body only when that body interacts with another at a lower temperature; any spontaneous process results in an increase of entropy
  4. first law of thermodynamics the fundamental principle of physics that the total energy of an isolated system is constant despite internal changes
  5. law of thermodynamics (physics) a law governing the relations between states of energy in a closed system
  6. thermodynamics physics concerned with heat and other forms of energy
  7. quantum electrodynamics a relativistic quantum theory of the electromagnetic interactions of photons and electrons and muons
  8. quantum chromodynamics a theory of strong interactions between elementary particles
  9. magnetohydrodynamics the study of the interaction of magnetic fields and electrically conducting fluids (as plasma or molten metal)
  10. thermodynamic of or concerned with thermodynamics
  11. thermodynamical of or concerned with thermodynamics
  12. astrodynamics the branch of astronomy that studies the motion of natural and artificial bodies in space
  13. hydrodynamics study of fluids in motion
  14. structural genomics the branch of genomics that determines the three-dimensional structures of proteins
  15. thermodynamically with respect to thermodynamics
  16. aerodynamics the branch of mechanics that deals with the motion of gases
  17. battle of Thermopylae a famous battle in 480 BC
  18. cervicofacial actinomycosis the commonest and least severe form of actinomycosis
  19. zero tolerance extreme intolerance of antisocial behavior
  20. supply-side economics the theory that lower taxes leads to financial prosperity