Etymology

ammeter

A1M3M3E1T1E1R1

Today it means: A device that measures the magnitude of an electric current, especially one calibrated in amperes. Full definition →

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

  1. Englishampere
  2. Proto-Indo-European*med-
  3. Proto-Indo-European*meh₁-
  4. Ancient Greekμέτρον (métron)
  5. English todayammeter

From ampere + -meter.

Etymology from Wiktionary, CC BY-SA 4.0.