Etymology

antiknock

A1N1T1I1K5N1O1C3K5

Today it means: Of an additive added to petroleum/gasoline to reduce the occurrence of engine knock. Full definition →

English knock ← Middle English knokken ← Old English cnocian
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The story

  1. Proto-Indo-European*h₂ent-
  2. Proto-Indo-European*h₂énts
  3. Proto-Indo-European*h₂énti
  4. Ancient Greekᾰ̓ντῐ́ (ăntĭ́)
  5. Ancient Greekἀντι- (anti-)
  6. Englishanti-
  7. Proto-Germanic*knukô
  8. Proto-Germanic*knukōną
  9. Proto-West Germanic*knokōn
  10. Old Englishcnocian
  11. Middle Englishknokken
  12. Englishknock
  13. English todayantiknock

From anti- + knock.

Etymology from Wiktionary, CC BY-SA 4.0.