Noun
a word introduced because an existing term has become inadequate
Source: WordNetNobody ever heard of analog clocks until digital clocks became common, so `analog clock' is a retronym Source: Internet
A retronym is a new name for something that differentiates the original from a more recent form or version. Source: Internet
This retronym was coined recently, together with NAS and SAN. Source: Internet
The term silent film is therefore a retronym that is, a term created to distinguish something retroactively. Source: Internet
The term snail-mail is a retronym to distinguish it from the quicker email. Source: Internet