[Fyron]

From what I understand of radioisotope dating, it rarely comes out with the correct date on samples of known age. We assume it works on samples of unknown age. There are dozens of examples of horrendously inaccurate dates published in scientific journals. Even parts from the Mt. St. Helens ordeal have been dated in the low millions.

The thing about that is a few million years of innaccuracy don't matter for dating things that are hundreds of millions of years old.

Radioisotope dating is not supposed to be relatively accurate for "newer" objects, only for "older" ones. It is never meant as an absolute indicator. People that use it as such are indeed using it incorrectly.

Without question, regardless of the original denotation and connotation, myth has a negative meaning now. It is indelibly linked with "fairy tale" in the minds of English speakers. Maybe we should develop a new word here and try to get it into the OED.

Only to people that think that the dictionary definition is the absolute authority. Dictionary definitions often do not address complex terms very well, and also tend to use (sometimes wrong) connotations as denotations. They also often completely miss some uses of more complex terms (most often literary terms- such as mythology).