 protactinium |
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| 1. | [ noun ] (chemistry) a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead | |
| Synonyms: | Pa atomic_number_91 protoactinium | |
| Related terms: | metallic_element | |
| Similar spelling: |
protoactinium protestation protectionism protoctist protistan Protestant protective protection protecting Protoctista Protestantism protagonist production prediction protectively |
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