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barium (n.)

1808, coined in Modern Latin by its discoverer, English chemist Sir Humphrey Davy, because it was present in the mineral barytes "heavy spar" (barium sulphate), so named by Lavoisier from Greek barys "heavy," from PIE root *gwere- (1) "heavy." The metal is actually relatively light. With chemical ending -ium. Related: Baric.

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Definitions of barium from WordNet

barium (n.)
a soft silvery metallic element of the alkali earth group; found in barite;
Synonyms: Ba / atomic number "
From wordnet.princeton.edu