Etymology

pyridinium

P3Y4R1I1D2I1N1I1U1M3

Today it means: The cationic, protonated form of pyridine Full definition →

English pyridine ← German Pyridin
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The story

  1. GermanPyridin
  2. Englishpyridine
  3. English todaypyridinium

From pyridine + -ium.

Etymology from Wiktionary, CC BY-SA 4.0.