Etymology

thinner

thin·ner
T1H4I1N1N1E1R1

Today it means: A liquid substance used to thin the consistency of another liquid. Full definition →

English thin ← Middle English thinne /thenne /thünne ← Old English þynne
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The story

  1. Proto-West Germanic*þunnī
  2. Old Englishþynne
  3. Middle Englishthinne /thenne /thünne
  4. Englishthin
  5. English todaythinner

From thin + -er.

Etymology from Wiktionary, CC BY-SA 4.0.