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WORDNET DICTIONARY
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WORDNET DICTIONARY
Noun heavy spar has 1 sense
- heavy spar(n = noun.substance) barite, barium sulphate, barytes - a white or colorless mineral (BaSO4); the main source of barium; is a kind of mineral
CIDE DICTIONARY
heavy spar,
Native barium sulphate or barite, -- so called because of its high specific gravity as compared with other non-metallic minerals. [1913 Webster]