Etymology

ommatidium

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Today it means: One of the conical substructures which make up the eyes of invertebrates with compound eyes. Full definition →

Ancient Greek ὀμματίδιον
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The story

  1. Ancient Greek · derived fromὀμματίδιον“little eye”
  2. English todayommatidium

From Ancient Greek ὀμματίδιον (ommatídion, “little eye”), equivalent to ὄμμα (ómma, stem ὄμματ-) + -idium.

Etymology from Wiktionary, CC BY-SA 4.0.