Webster's English Dictionary

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hydrogen

Cross references:
  1. deuterium              2. tritium                3. element               
  
hy.dro.gen \'hi--dr*-j*n\ \hi--'dra:j-*-n*s\ n [F hydroge'ne, fr. hydr- + 
   -ge'ne -gen; fr. the fact that w]ater is generated by its combustion : a 
   nonmetallic univalent element that is the simplest and lightest of the  
   elements, is normally a colorless odorless highly flammable diatomic gas, 
   and is used esp. in the production of its economic compounds - 
   hy.drog.e.nous aj