Etymology

actinometer

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Today it means: An instrument used to measure the heating power of electromagnetic radiation, especially that of solar radiation. Full definition →

Ancient Greek μέτρον (métron) ← Proto-Indo-European *meh₁- ← English actino-
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The story

  1. Ancient Greekᾰ̓κτῑ́ς (ăktī́s)
  2. Englishactino-
  3. Proto-Indo-European*med-
  4. Proto-Indo-European*meh₁-
  5. Ancient Greekμέτρον (métron)
  6. English todayactinometer

From actino- + -meter.

Etymology from Wiktionary, CC BY-SA 4.0.