Webster's English Dictionary

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thermodynamic

ther.mo.dy.nam.ic \.th*r-m*-(.)di--'nam-ik\ \-i-k(*-)le-\ aj 1: of or 
   relating to thermodynamics  2: being an aggregation of atoms, molecules, 
   collodial particles, or large r bodies that constitute an isolated group - 
   ther.mo.dy.nam.i.cal.ly av