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

 

patois

 noun
noun
BrE BrE//ˈpætwɑː//
 
; NAmE NAmE//ˈpætwɑː//
 
(pl. patois
BrE BrE//ˈpætwɑːz//
 
; NAmE NAmE//ˈpætwɑːz//
 
)
 
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a form of a language, spoken by people in a particular area, that is different from the standard language of the country She began shouting at him in a patois he could not understand. They were speaking in French patois. Word Origin mid 17th cent.: French, literally ‘rough speech’, perhaps from Old French patoier ‘treat roughly’, from patte ‘paw’.
See the Oxford Advanced American Dictionary entry: patois