Etymology

diopter

D2I1O1P3T1E1R1

Today it means: A unit of measure of the power of a lens or mirror, equal to the reciprocal of its focal length in meters. Myopia is diagnosed and measured in diopters. Full definition →

Latin dioptra ← Ancient Greek διόπτρα
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The story

  1. Ancient Greek · derived fromδιόπτρα
  2. Latin · derived fromdioptra
  3. English todaydiopter

From Latin dioptra, from Ancient Greek διόπτρα (dióptra).

Etymology from Wiktionary, CC BY-SA 4.0.