Etymology

protonium

P3R1O1T1O1N1I1U1M3

Today it means: An exotic atom consisting of a proton bound to an antiproton. Full definition →

English proton ← Ancient Greek πρῶτον (prôton) ← Proto-Indo-European *pró
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The story

  1. Proto-Indo-European*per-der.?
  2. Proto-Indo-European*pér
  3. Proto-Indo-European*pró
  4. Ancient Greekπρό (pró)
  5. Ancient Greekπρῶτον (prôton)
  6. Englishproton
  7. English todayprotonium

From proton + -ium.

Etymology from Wiktionary, CC BY-SA 4.0.