Definition of retronym noun from the Oxford Advanced American Dictionary

 

retronym

 noun
noun
NAmE//ˈrɛtrənɪm//
 
 
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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 Learner's Dictionary entry: retronym