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Vinony

protactinium

noun

  1. element with the atomic number of 91
L18286 on Wikidata ↗

Wiktionary

Pronunciation: /ˌpɹəʊ.tækˈtɪn.i.əm/ / /ˌpɹoʊ.tækˈtɪn.i.əm/

noun

Etymology: 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.

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