Fascinating relationships. I was searching for more information about the nature of stealth in the MW Unabridged, and came across irreption as a synonym for a type of stealth.

Irreption came from the same root as reptile, which came from a Latin root meaning "to creep."

But just as interesting was the quoted example for use of irreption, which I'll paste below:

": an act or instance of entering by stealth or inadvertence <the irreption of pseudoclassical plurals in technical language> "

I'd loved to know an example of a 'pseudoclassical plural' if any of you know of one offhand!