/ ˈbaɪndə(r); NAmE / noun
1.
[ C ] a hard cover for holding sheets of paper, magazines, etc. together :
a ring binder
2.
[ C ] a person or machine that puts covers on books
3.
[ C , U ] a substance that makes things stick or mix together in a solid form
4.
[ C ] a machine that fastens wheat into bunches after it has been cut