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barium US English

The chemical element of atomic number 56, a soft white reactive metal of the alkaline earth group

barium New Oxford Dictionary for Writers & Editors

chemical element of atomic number 56

Ba in barium US English

The chemical element of atomic number 56, a soft white reactive metal of the alkaline earth group

barium sulfate US English

An odorless, insoluble white powder used in the making of pigments, paper, textiles, and plastics, and ingested as a contrasting agent in X-raying the digestive tract