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

 

Mars Bar™

 noun
noun
BrE
 
; NAmE
 
(also Mars)
 
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a chocolate bar with a soft sweet filling popular in Britain. It was first sold in the 1930s and named after the American who originally made it, Forrest Mars. The advertisements for Mars Bars have claimed that ‘A Mars a day helps you work, rest and play.’