a person or thing that supplies food or feeds something.
a bin or boxlike device from which farm animals may eat, especially such a device designed to allow a number of chickens to feed simultaneously or to release a specific amount of feed at regular intervals.
a person or thing that takes food or nourishment.
a livestock animal that is fed an enriched diet to fatten it for market. Compare stocker ( def 2 ).
a person or device that feeds a machine, printing press, etc.
a tributary stream.
Also, feed. Electricity. a conductor, or group of conductors, connecting primary equipment in an electric power system.
British. a baby's bib.
Theater Slang. straight man.
being, functioning as, or serving as a feeder.
pertaining to livestock to be fattened for market.

1350–1400; Middle English; see feed, -er1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
feeder (ˈfiːdə)
1.  a person or thing that feeds or is fed
2.  a child's feeding bottle or bib
3.  chiefly (US), (Canadian) agriculture a head of livestock being fattened for slaughter
4.  a person or device that feeds the working material into a system or machine
5.  a tributary channel, esp one that supplies a reservoir or canal with water
6.  a.  a road, service, etc, that links secondary areas to the main traffic network
 b.  (as modifier): a feeder bus
7.  a.  a transmission line connecting an aerial to a transmitter or receiver
 b.  a power line for transmitting electrical power from a generating station to a distribution network

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

early 15c., one who feeds an animal; 1560s, one who eats; agent noun from feed. Of cattle and streams, by 1790s; of roads and railroads, by 1850s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The researchers then trained nectar-eating bats to find a feeder hidden in
  artificial foliage.
But when they took out the lawn, they realized they had shallow feeder rots out
  to the edges of their property in all directions.
It occurs to me that each of the bare-root cherries cost me about the same
  amount of money as a good bird feeder.
Face facts: there are some people who will never be satisfied with the design
  as long as it's not a bird feeder.
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