Definition of mac noun from the Oxford Advanced Learner's Dictionary

 

mac

 noun
(also mack)noun
BrE BrE//mæk//
 
; NAmE NAmE//mæk//
 
(old-fashioned mackintosh)(all British English) Rain
 
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a coat made of material that keeps you dry in the rain He was standing in the pouring rain with his mac on. See related entries: Rain Word Origin early 20th cent.: abbreviation.