Etymology

ultrathin

U1L1T1R1A1T1H4I1N1

Today it means: Extremely thin; of utmost thinness. Full definition →

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

  1. Proto-Indo-European*h₂el-
  2. Latinūls
  3. Latinultrā
  4. Englishultra-
  5. Proto-West Germanic*þunnī
  6. Old Englishþynne
  7. Middle Englishthinne /thenne /thünne
  8. Englishthin
  9. English todayultrathin

From ultra- + thin.

Etymology from Wiktionary, CC BY-SA 4.0.