Advances in technology are often responsible for the coinage of retronyms. For example, the term "acoustic guitar" was coined at the advent of electric guitars and analog watches were thus named to distinguish them from digital watches.
The first bicycles with two wheels of equal size were called "safety bicycles" because they were easier to handle than the then-dominant style that had one large wheel and one small wheel, which then became known as an "ordinary" bicycle. Since the end of the 19th century, most bicycles have been expected to have two equal sized wheels, and the other type has been renamed "penny-farthing" or "high-wheeler" bicycle.
With the increasing discussion and legalization of same-sex marriage in the 20th and 21st centuries, terms such as "straight marriage" and "heterosexual marriage" arose to distinguish a set of unions which the term "marriage" had previously meant by default.[dubious ]
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". Wordnet.
The Merriam lexies, always strong on etymology, cite the earliest usage they can find of retronym in this column in 1980, which credited Frank Mankiewicz, then president of National Public Radio, as the coiner. He was especially intrigued by the usage hardcover book, which was originally a plain book until softcover books came along, which were originally called paperback and now have spawned a version the size of a hardcover but with a soft cover trade-named with the retronym trade paperback.
Retronyms. We use them, and create them, almost every day, but most people don't know what they are. Don't reach for your dictionary; you won't find it there. Not unless it's the current American Heritage dictionary - the only one, to date, to list the word
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