noun
labia majora
Anatomical term for the outer folds of the vulva.
大陰唇は外陰部の一部です。
The labia majora are part of the external genitalia.
小陰唇 (labia minora) are the inner folds, while 大陰唇 are the outer folds.
From 大 (large) + 陰唇 (labia), a straightforward kanji compound.