Alphabet Filter:

Results

Definition of thorium:

  1. 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.

Synonyms:

atomic number 90, Th.

Usage examples: