|(jargon)||retronym - A term invented to distinguish a subclass of things
from new members of the superclass, where the distinction was
previously not necessary, since the old subclass had been all
there was of the superclass.|
For example, the retronyms "snail mail" and "paper mail" were coined by those for who "mail" was likely to mean electronic mail.
While the English language in general has a few retronyms ("whole milk", "snow skiing", "acoustic guitar"), hacker jargon is necessarily (at points capriciously) rich in retronyms, e.g. plaintext, natural language, impact printer, eyeball search, biological virus.