any machine or device capable of automatically supplying materials when and where they are needed, esp one for making measured quantities of food constantly available to farm livestock
self-feeder in American English
(ˌselfˈfidər, ˈself-)
noun
an apparatus or machine that automatically discharges a supply of some material, esp. one consisting of a hopper and a trough for feeding livestock
Word origin
[1825–35]This word is first recorded in the period 1825–35. Other words that entered Englishat around the same time include: breakdown, cliché, individualism, relativity, self-help