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

 

retronym

 noun
noun
BrE BrE//ˈretrəʊnɪm//
 
; NAmE NAmE//ˈretroʊnɪm//
 
 
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a new name that is given to something that has existed for a long time, in order to distinguish it from a more modern development The list of retronyms includes acoustic guitar, manual typewriter, silent movie and landline phone.
See the Oxford Advanced American Dictionary entry: retronym