noun, noun which may take the genitive case particle 'no'
Used to describe items, facilities, or categories intended for men. Often appears in compound nouns like 男子用トイレ (men's restroom) or 男子用制服 (boys' uniform).
この階には男子用トイレしかありません。
There is only a men's restroom on this floor.
男子用の制服はネクタイが付いています。
The boys' uniform comes with a tie.
男性用 also means 'for men', but is slightly more formal and often used for adult men, while 男子用 can include boys.
Compound of 男子 (boy, man) and 用 (use, purpose). The reading だんし + よう contracts to だんしよう.