retronym
noun
ret·ro·nym ˈre-trō-ˌnim 
: a term (such as analog watch, film camera, or snail mail) that is newly created and adopted to distinguish the original or older version, form, or example of something (such as a product) from other, more recent versions, forms, or examples
Consider reduplicated retronyms: first came paperback book, differentiated from a book with a cloth or leather binding, provoking the retronym hardcover book.
William Safire
William SafireMost retronyms are gleaned from high-technology and scientific advances that bring about a modification of an original item. Think of it as a backward glance that signifies progress (film camera, broadcast network, propeller airplane). Lyrysa Smith
Lyrysa Smith
Did you know?
Remember way back when cameras used film? Back then, such devices were simply called cameras; they weren't specifically called film cameras until they needed to be distinguished from the digital cameras that came later. Similarly, the term desktop computer wasn't often used until laptops became prevalent. A lot of our common retronyms have come about due to technological advances: acoustic guitar emerged to contrast with electric guitar, and brick-and-mortar store to distinguish traditional stores from online retailers. Retronym was coined by Frank Mankiewicz, an American journalist and former president of National Public Radio, and was first seen in print in 1980.
Example Sentences
Recent Examples on the Web Yet here came a band with the ridiculous retronym Tom Petty and the Heartbreakers — a handle straight out of the dorky, black-and-white early 1960s, when girls still danced in poodle skirts on American Bandstand. Kyle Smith, National Review, 3 Oct. 2017
Kyle Smith, National Review, 3 Oct. 2017 Word History
Etymology
retro- + -onym
First Known Use
1980, in the meaning defined above