protoactinium

P3R1O1T1O1A1C3T1I1N1I1U1M3

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

Similar
protactiniumPaatomic number 91
Scrabble 19
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Meanings

nounprotoactinium (uncountable)
  1. dateduncountableDated form of protactinium.

Synonyms & antonyms

nouna short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead

Similar
protactiniumPaatomic number 91
Broader
metallic elementmetal
Also see
paprotactinium

Synonym sets from Open English WordNet, CC BY 4.0.

Cite this entry
APA

protoactinium. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/protoactinium

MLA

“protoactinium.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/protoactinium. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “protoactinium,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/protoactinium.

Source: protoactinium on Wiktionary, CC BY-SA 4.0.