Letter B

Barium

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<B>1.</B> A metallic element belonging to the alkaline earths with an atomic number of 56 and an atomic weight of 137.34. The symbol for barium is Ba.<BR><B>2.</B> In medicine, refers to a chalky solution of barium used to coat the inside of organs so that they will show up on an x-ray.<BR>See also: Barium enema; Barium swallow

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