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

 

junk food

 noun
noun
BrE BrE//ˈdʒʌŋk fuːd//
 
; NAmE NAmE//ˈdʒʌŋk fuːd//
 
(also junk)[uncountable](also junk foods [plural])(informal, disapproving) Diet, Unhealthy eating habits
 
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food that is quick and easy to prepare and eat but that is thought to be bad for your health See related entries: Diet, Unhealthy eating habits
See the Oxford Advanced American Dictionary entry: junk food