noun
soft palate
Anatomical term for the soft, posterior part of the roof of the mouth.
軟口蓋は、口蓋の後ろの柔らかい部分です。
The soft palate is the soft part at the back of the roof of the mouth.
硬口蓋 is the hard palate, the bony front part of the roof of the mouth, while 軟口蓋 is the soft, muscular back part.
Compound of 軟 (nan, 'soft') + 口蓋 (kōgai, 'palate'). 口蓋 itself is a Sino-Japanese term from 口 (kō, 'mouth') and 蓋 (gai, 'lid, cover').