Etymology

monoeye

M3O1N1O1E1Y4E1

Today it means: The eye of a one-eyed creature. Full definition →

Japanese モノアイ
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The story

  1. Japanese · calque of単眼
  2. Japanese · borrowed fromモノアイ
  3. English todaymonoeye

From mono- + eye. The monster girl type sense is possibly a reborrowing from Japanese モノアイ (monoai) or a calque of Japanese 単眼 (tangan).

Etymology from Wiktionary, CC BY-SA 4.0.