Webster's English Dictionary

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argon

Cross references:
  1. element               
 
ar.gon \'a:r-.ga:n\ n [Gk, neut. of argos idle, lazy, fr. a- + ergon work - 
   more]at WORK : a colorless odorless inert gaseous element found in the air 
   and in volca nic gases and used esp. as a filler for electric bulbs and 
   electron tubes