noun, noun which may take the genitive case particle 'no'
front button; fly button
Refers to buttons on the front of a garment, especially the fly button on trousers or jeans.
ジーンズの前ボタンが取れてしまった。
The fly button on my jeans came off.
このシャツは前ボタンが全部貝殻でできている。
All the front buttons on this shirt are made of shell.