ba|ri|um [ˈbeəriəm US ˈber-] n [U]
[Date: 1800-1900; : Greek; Origin: barytes 'weight']
1.) a soft silver-white metal that is used to make ↑pigments (=dry coloured powders used to make paints) . It is a chemical ↑element : symbol Ba.
2.) a barium meal/enema/swallow
a substance containing barium that you swallow or that is put in your ↑bowels before you have an ↑X-ray, because it makes the organs in your body easier to see

Dictionary of contemporary English. 2013.

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