| NOUN | substance | protoactinium, protactinium, Pa, atomic number 91 | a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead |
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| Meaning | A short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead. | |
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| Synonyms | protactinium, Pa, atomic number 91 | |
| Broader | metallic element, metal | Any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. |
| Spanish | número atómico 91, protactinio, protoactinio, protoactinium | |
| Catalan | protactini, protactinio, protoactini, protoactinium | |
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