Definition of Wonderbra™ noun from the Oxford Advanced Learner's Dictionary

 

Wonderbra™

 noun
noun
BrE
 
; NAmE
 
 
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a popular make of bra (= an item of underwear that women wear to support their breasts). Wonderbras, which were introduced in 1968, make the breasts appear larger. They became very well known in Britain in the 1990s after a major advertising campaign showing attractive women wearing them.