Webster's English Dictionary

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pleura

pleu.ra \'plu.r-*\ \'plu.(*)r-.e-, -.i-\ \'plu.r-*l\ n or pleu.rae or 
   pleuras [Gk, rib, side] pl  : the delicate serous membrane lining each half 
   of the thorax of mammals a nd folded back over the surface of the lung of 
   the same side - pleu.ral aj