NCIt definition : A naturally occurring alkaline metalloid element with atomic symbol Ba, atomic number
56, and atomic weight 137 that is only found in combination with other elements, typically
barite (barium sulfate) and witherite (barium carbonate), or chemicals. Barium is
used in many industrial processes, as well as in diagnostic testing, fireworks, and
pesticides. It is characterized as a silvery white or yellow to white metallic solid
that is odorless. Exposure occurs by inhalation, ingestion, or contact.;
Alternative definition : CDISC: The metal agent barium.;