Webster's English Dictionary

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nitrogen

Cross references:
  1. element               
 
ni.tro.gen \'ni--tr*-j*n\ \ni--'tra:j-*-n*s\ n [F nitrogene, fr. nitr- + 
   -ge'ne -gen] often attrib  : a colorless tasteless odorless gaseous element 
   that constitutes 78 perce nt of the atmosphere by volume and is a 
   constituent of all living tissues - ni.trog.e.nous aj