protactinium.
A chemical element (symbol Pa) with atomic number 91. A dense, silvery-gray actinide metal.
Meaning & usage
A chemical element (symbol Pa) with atomic number 91. A dense, silvery-gray actinide metal.
A chemical element (symbol Pa) with atomic number 91. A dense, silvery-gray actinide metal. An atom of this element.
Where this word comes from
Etymology tree Proto-Indo-European *per-der.? Proto-Indo-European *per-der.? Proto-Indo-European *pér Proto-Indo-European *-o Proto-Indo-European *próder. Ancient Greek πρό (pró) Ancient Greek -ᾰτος (-ătos) Ancient Greek πρῶτος (prôtos) Ancient Greek πρωτο- (prōto-)lbor. English proto- English actinium English protactinium From proto- + actinium.
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Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.