Etymology

interneurons

I1N1T1E1R1N1E1U1R1O1N1S1
English neuron ← Latin inter- ← Proto-Italic *n̥ter
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The story

  1. Proto-Indo-European*h₁én
  2. Proto-Indo-European*h₁n̥tér
  3. Proto-Italic*n̥ter
  4. Latininter
  5. Latininter-
  6. Englishinter-
  7. Englishneuron
  8. English todayinterneurons

From inter- + neuron.

Etymology from Wiktionary, CC BY-SA 4.0.