Etymology

infrasonic

I1N1F4R1A1S1O1N1I1C3

Today it means: Having frequencies below the human audible range Full definition →

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

  1. Proto-Indo-European*h₁én
  2. Proto-Italic*en
  3. Proto-Italic*en-
  4. Latinin-
  5. Proto-Indo-European*bʰer-
  6. Proto-Indo-European*bʰéreti
  7. Proto-Italic*ferō
  8. Latinferō
  9. Latinīnferō
  10. Latinīnfrā
  11. Englishinfra-
  12. Proto-Indo-European*swenh₂-
  13. Proto-Indo-European*swónh₂os
  14. Latinsonus
  15. Englishsonic
  16. English todayinfrasonic

From infra- + sonic.

Etymology from Wiktionary, CC BY-SA 4.0.