A gaseous element, atomic no. 18, atomic wt. 39.948, present in the dry atmosphere in the proportion of about 0.94%; one of the noble gases. [G. ntr. of argos, lazy, inactive, fr. a- priv. + ergon, work]
* * *
ar·gon 'är-.gän n a colorless odorless inert gaseous element found in the air and in volcanic gases and used esp. in lasers and electric bulbs symbol Ar see ELEMENT (table)
* * *
ar·gon (Ar) (ahrґgon) [Gr. argos inert] a chemical element, atomic number 18, discovered in the atmosphere in 1895. One of the inert gases, atomic weight 39.948.Medical dictionary. 2011.