Etymology

optical

O1P3T1I1C3A1L1

Today it means: Of or relating to sight; visual. Full definition →

Proto-Indo-European *h₂élisder.? ← English optic
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The story

  1. Englishoptic
  2. Proto-Indo-European*h₂el-
  3. Proto-Indo-European*h₂élisder.?
  4. English todayoptical

From optic + -al.

Etymology from Wiktionary, CC BY-SA 4.0.