Where does “eka-protactinium” come from?

eka-protactinium (English) comes from English protactinium, from English proto-, from Ancient Greek πρωτο-, from Ancient Greek πρῶτος, from Ancient Greek πρό, from Proto-Indo-European pró, from Proto-Indo-European per-, from Proto-Indo-European pr̥tós — passed , crossed.

eka-protactinium (English): unbitrium (Ubt), an unsynthesized chemical element with atomic number 123

Definitions

  1. unbitrium (Ubt), an unsynthesized chemical element with atomic number 123

Ancestry of “eka-protactinium”, step by step

StepLanguageWordMeaning
1EnglishprotactiniumA chemical element with atomic number 91: a...
2Englishproto-first; most recent common ancestor of; Relating...
3Ancient Greekπρωτο-first, primary
4Ancient Greekπρῶτοςfirst; earliest; foremost, most prominent
5Ancient Greekπρόbefore; before, in front, forth, forward; before,...
6Proto-Indo-Europeanprótoward, leading to
7Proto-Indo-Europeanper-before, in front; first; to go through
8Proto-Indo-Europeanpr̥tóspassed , crossed
Every word from Proto-Indo-European pr̥tósEvery word from Proto-Indo-European per-Every word from Proto-Indo-European pró