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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Isopiestic  \I`so*pi*es"tic\,  a.  [Iso-  +  Gr  ?  to  press.] 
  Having  equal  pressure. 
  {Isopiestic  lines},  lines  showing,  in  a  diagram,  the 
  relations  of  temperature  and  volume,  when  the  elastic 
  force  is  constant;  --  called  also  {isobars}.