A retronym is a newer name for an existing thing that helps differentiate the original form/version from a more recent one. It is thus a word or phrase created to avoid confusion between older and newer types, whereas previously (before there were more than one type) no clarification was required.[1][2]

Advances in technology are often responsible for the coinage of retronyms. For example, the term "acoustic guitar" was coined with the advent of electric guitars;[3] analog watches were renamed to distinguish them from digital watches once the latter were invented;[4] association football, rugby football, and gridiron football were coined to distinguish types of football; and "push bike" was created to distinguish from motorbikes and motorized bicycles.