Definition of pea-souper noun from the Oxford Advanced Learner's Dictionary

 

pea-souper

 noun
noun
BrE BrE//ˌpiː ˈsuːpə(r)//
 
; NAmE NAmE//ˌpiː ˈsuːpər//
 
(old-fashioned, British English, informal)
 
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a very thick yellowish fog