Definition of size zero noun from the Oxford Advanced Learner's Dictionary

 

size zero

 noun
noun
BrE
 
; NAmE
 
[uncountable, countable]
 
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(in the US) the smallest size for women’s clothes, used to describe women who are extremely thin size zero models and celebrities She is a size zero. the fashion industry’s obsession with size zero
See the Oxford Advanced American Dictionary entry: size zero