monoeye

Etymology

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).

noun

The eye of a one-eyed creature.
A humanlike monster girl with a single large eye.“Tysm Hitomi!! They are both so cute! 😳💖 Why does everyone have a cute monoeye OC~”