Etymology

radiationless

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Today it means: That involves no radiation of energy Full definition →

Proto-Germanic *lausaz ← Proto-Indo-European *lewHs- ← English radiation
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The story

  1. Latinradiatio
  2. Englishradiation
  3. Proto-Indo-European*lewh₁-
  4. Proto-Indo-European*lewHs-
  5. Proto-Germanic*leusaną
  6. Proto-Germanic*lausaz
  7. English todayradiationless

From radiation + -less.

Etymology from Wiktionary, CC BY-SA 4.0.