barium

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun a soft silvery metallic element of the alkali earth group; found in barite

Coined by British chemist Humphry Davy in 1808, from baryta + -ium.

A mixture of equal parts of cryolite and barium chloride is very good in soldering bronze or aluminum alloys. — Practical Mechanics for Boys, James Slough Zerbe
Since the outside surface had not been in contact with Oswald’s cheek, the barium and antimony found there had come from a source other than Oswald. — Report of the President's Commission on the Assassination of President John F. Kennedy, United States. Warren Commission
So then he tried a little calcium, aluminum, barium, and strontium, a little clear bitumen, and a half of a third of a sixteenth of a grain of arsenic. — The Peterkin Papers, Lucretia P. (Lucretia Peabody) Hale

Ba, atomic number 56

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