Etymology

infrasound

I1N1F4R1A1S1O1U1N1D2

Today it means: Sound waves having a frequency below the human audible range (below about 20 Hz). Full definition →

English sound ← Latin īnfrā ← Proto-Italic *ferō
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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. Englishsound
  13. English todayinfrasound

From infra- + sound.

Etymology from Wiktionary, CC BY-SA 4.0.