noun
Anatomical term for the external female genitalia. Used in medical or formal contexts; in everyday conversation, more colloquial terms are common.
女陰の構造について医学書で学んだ。
I learned about the structure of the vulva in a medical textbook.
この図は女陰の解剖学的な名称を示している。
This diagram shows the anatomical names of the female external genitalia.
Sino-Japanese compound: 女 (woman, female) + 陰 (yin, hidden, genital area). The reading じょいん is the standard on'yomi; にょいん is a variant reading sometimes encountered.