ring binder
Word forms: ring binders
countable noun
A ring binder is a file with hard covers, which you can insert pages into. The pages are held in by metal rings on a bar attached to the inside of the file.
It works like an old-school ring binder or filing cabinet.
Image of ring binder
© 01/05/2018, Shutterstock
Translations:
Chinese: 扣眼活页簿
Japanese: リングバインダー