barium definition, etymology and usage, examples and ...
n Barium (Chem) One of the elements, belonging to the alkaline earth group; a metal having a silverwhite color, and melting at a very high temperature. It is difficult to obtain the pure metal, from the facility with which it becomes oxidized in the air. Atomic weight, 137. Symbol, Ba. Its oxide called baryta. ☞ Some of the compounds of this element are remarkable for their high specific ...