Etymology

gegenion

G2E1G2E1N1I1O1N1

Today it means: A counterion: an ion of opposite charge to another in an electrochemical or ion transport system. Full definition →

German gegen
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The story

  1. German · borrowed fromgegen“against”
  2. English todaygegenion

From the German gegen (“against”) + ion.

Etymology from Wiktionary, CC BY-SA 4.0.