feed ‧ er /ˈfiːdə $ -ər/ BrE AmE noun [countable]
1 . a container with food for animals or birds:
a bird feeder
2 . something that provides supplies for something else:
The Shyok River is a major feeder of the Indus River.
The length of the feeder pipe is 50m.
3 . a piece of equipment that supplies something to a machine:
the printer’s paper feeder
4 . a person or animal that eats in a particular way:
Catfish are bottom feeders (=they feed at the bottom of rivers) .
5 . a small road, railway line, or ↑ airline service that takes traffic to a main road, line, or service