Etymology

subsonic

S1U1B3S1O1N1I1C3

Today it means: having a frequency too low to be audible Full definition →

English sonic ← Latin sonus ← Proto-Indo-European *swónh₂os
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The story

  1. Proto-Indo-European*upó
  2. Proto-Italic*supo
  3. Latinsub
  4. Latinsub-
  5. Englishsub-
  6. Proto-Indo-European*swenh₂-
  7. Proto-Indo-European*swónh₂os
  8. Latinsonus
  9. Englishsonic
  10. English todaysubsonic

From sub- + sonic.

Etymology from Wiktionary, CC BY-SA 4.0.