protactinium | ||
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 |