Barium

Barium is a chemical element; it has symbol Ba and atomic number 56. It is the fifth element in group 2 and is a soft, silvery alkaline earth metal. Because of its high chemical reactivity, barium is never found in nature as a free element.

British chemist

star whose spectra indicate an overabundance of ionized barium

radiographs used to examine abnormalities of the colon

radiographs used to examine abnormalities of the digestive system excluding the colon

Baritosis is a benign type of pneumoconiosis, which is caused by long-term exposure to the dust of insoluble compounds of barium, such as ground baryte ore.