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os·mi·um
 osmium
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- pronunciation:
- az
mi
 m
- features:
- Word Combinations (noun)
| part of speech: |
noun |
| definition: |
a chemical element that has seventy-six protons in each nucleus and that occurs as an octavalent ion or in pure form as an extremely hard, dense, brittle bluish metal solid used as a catalyst and esp. in alloys and in electron microscopy because of its extremely high density. (symbol: Os)
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