Retronym

A retronym is a type of neologism that provides a new name for something to differentiate the original from a more recent form or version. Advances in technology are often responsible for retronym coinage. For example, the term `acoustic guitar` was coined at the advent of electric guitars, and analog watches were thus named to distinguish them .....
Found on http://en.wikipedia.org/wiki/Retronym

retronym

noun a word introduced because an existing term has become inadequate; `Nobody ever heard of analog clocks until digital clocks became common, so `analog clock` is a retronym`
Found on https://www.encyclo.co.uk/local/20974

retronym

new name as modification of older term used alone
Found on http://phrontistery.info/r.html

retronym

retronym 1. A combination of retro- + synonym; a term that distinguishes a subclass from members of a superclass, e.g., `snail mail” is a retronym coined by those for whom `mail” is likely to mean `e-mail”. 2. An adjective-noun pairing generated by a change in the meaning of the noun, usually because of advances in technology. 3. A term; suc...
Found on http://www.wordinfo.info/words/index/info/view_unit/1840/2
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