third eyelid

Japanese: third eyelid(英語表記)thirdeyelid
third eyelid

…the third eyelid is a thin, transparent membrane that lies under the eyelid and can open and close across the front of the eye. Its function is similar to that of the eyelid, moistening the cornea and removing foreign bodies from the cornea.

*Some of the terminology explanations that mention "third eyelid" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…まぶたの下にあり,眼球前面を横切って開閉できる透明な薄膜で,第三眼瞼(がんけん)third eyelidともいう。この薄膜の機能はまぶたの機能とほぼ同じで,開閉することによって角膜を湿らせ,また角膜上の異物を除去する。…

※「third eyelid」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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