Protactinium

//ˌpɹoʊ.tækˈtɪn.i.əm// noun

noun ·Rare ·Advanced level

Definitions

Noun

1
A chemical element (symbol Pa) with atomic number 91. A dense, silvery-gray actinide metal. uncountable
2
a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead wordnet

Synonyms

protoactinium atomic number 91 element gold iron lead

Etymology

From proto- + actinium.

Related phrases

eka-protactinium atomic number

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.