in reply to Re^2: Perl Etymology, a Recondite List
in thread Perl Etymology, a Recondite List

Ah, yes. It seems retronym is a word, but the wrong one. From dictionary.com:

retronym, n.
A word or phrase created because an existing term that was once used alone needs to be distinguished from a term referring to a new development

Backronym is indeed the correct word here.