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

 

misnomer

 noun
noun
BrE BrE//ˌmɪsˈnəʊmə(r)//
 
; NAmE NAmE//ˌmɪsˈnoʊmər//
 
 
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a name or a word that is not appropriate or accurate ‘Villa’ was something of a misnomer—the place was no more than an old farmhouse. Word Origin late Middle English: from Anglo-Norman French, from the Old French verb mesnommer, from mes- ‘wrongly’ + nommer ‘to name’ (based on Latin nomen ‘name’).
See the Oxford Advanced American Dictionary entry: misnomer