What does "protactinium" mean?

A chemical element (symbol Pa) with atomic number 91. A dense, silvery-gray actinide metal.

What is a synonym for "protactinium"?

Common synonyms include: atomic number 91, element, gold, iron, lead, metal.

Pronounced //ˌpɹoʊ.tækˈtɪn.i.əm//.

/ˌpɹoʊ.tækˈtɪn.i.əm/ noun

noun ·Rare ·Advanced level

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

From proto- + actinium.