Word.ws English Dictionary

protoactinium

protoactinium is the dated form of protactinium.

Meaning of protactinium

Noun

protactinium (uncountable)

  1. A chemical element (symbol Pa) with atomic number 91. A dense, silvery-gray actinide metal.
    1. (countable) An atom of this element.

Questions about protoactinium

What is protoactinium the dated form of?
Protoactinium is the dated form of protactinium.

Words near protoactinium in the dictionary

  1. Proto-World
  2. Proto-Yeniseian
  3. Proto-Yeniseians
  4. Proto-Yukaghir
  5. protoacademic
  6. protoactinium
  7. protoadditive
  8. protoalkaloid
  9. protoalkaloids
  10. protoanalysis
  11. protoanalytical

Source and license

Adapted from Wiktionary: protoactinium (page history and authors); protactinium (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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