From Wiktionary, the free dictionary
Compare Chinese 單眼皮/单眼皮 (dānyǎnpí), from 單/单 (dān, “single”) + 眼皮 (yǎnpí, “eyelid”).
single eyelid (plural single eyelids)
- An upper eyelid that has no noticeable fold when the eye is open; typical of East Asian eyes.
upper eyelid with no fold