Definition of food chain noun from the Oxford Advanced Learner's Dictionary

 

food chain

 noun
noun
BrE
 
; NAmE
 
(also the food chain)
 
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a series of living creatures in which each type of creature feeds on the one below it in the series Insects are fairly low down (on) the food chain. Pesticides work their way up the food chain from plants, through insects and birds to humans.
See the Oxford Advanced American Dictionary entry: food chain