Thorinum

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Thorium \Tho"ri*um\, n. [NL. See {Thorite}.] (Chem.)
     A metallic element found in certain rare minerals, as
     thorite, pyrochlore, monazite, etc., and isolated as an
     infusible gray metallic powder which burns in the air and
     forms thoria; -- formerly called also {thorinum}. Symbol Th.
     Atomic weight 232.0.


     [1913 Webster]