Quote Originally Posted by Paul G. View Post
dialecticism - definition of dialecticism by the Free Online Dictionary, Thesaurus and Encyclopedia.
dialecticism
1. a dialect word or expression.
2. dialectal speech or influence.
So, is it incorrect?
As I said, to my ears, "dialectism" belongs to linguistics, but "dialecticism" belongs to philosophy. However, others might disagree with me!

So to avoid confusion, I would recommend "dialect usage" or "regionalism". For instance,"Pronouncing wash as waRsh is a regionalism heard in Baltimore."