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Definitions and Synonyms of protoactinium | Another word for protoactinium | What is protoactinium?

Definition 1: a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead - [noun denoting substance]

Synonyms for protoactinium in the sense of this definition

(protoactinium is a kind of ...) any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.

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