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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Isobar  \I"so*bar\,  n.  [Iso-  +  Gr  ?  weight.]  (Phys.  Geog.) 
  A  line  connecting  or  marking  places  upon  the  surface  of  the 
  earth  where  height  of  the  barometer  reduced  to  sea  level  is 
  the  same  either  at  a  given  time,  or  for  a  certain  period 
  (mean  height),  as  for  a  year;  an  isopiestic  line  [Written 
  also  {isobare}.]