BARIUMS
Noun
bariums
plural of barium
Source: Wiktionary
BARIUM
Ba"ri*um, n. Etym: [NL., fr. Gr. bary`s heavy.] (Chem.)
Definition: One of the elements, belonging to the alkaline earth group; a
metal having a silver-white color, and melting at a very high
temperature. It is difficult to obtain the pure metal, from the
facility with which it becomes oxidized in the air. Atomic weight,
137. Symbol, Ba. Its oxide called baryta. [Rarely written barytum.]
Note: Some of the compounds of this element are remarkable for their
high specific gravity, as the sulphate, called heavy spar, and the
like. The oxide was called barote, by Guyton de Morveau, which name
was changed by Lavoisier to baryta, whence the name of the metal.
Source: Webster’s Unabridged Dictionary 1913 Edition