English dictionary
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English noun: promethium | |||
| 1. | promethium (substance) a soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium | ||
| Synonyms | atomic number 61, Pm | ||
| Broader (hypernym) | metal, metallic element | ||
Based on WordNet 3.0 copyright © Princeton University.
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Web design: Orcapia v/Per Bang. English edition: .
2025 onlineordbog.dk