etymon

noun1

1. •
   The original or earlier form of an inherited or borrowed word, affix, or morpheme either from an earlier period in a language's development, from an ancestral language, or from a foreign language.

   • Here such cases as ghost words & misglosses, secondary semantics, different etymologies for one etymon or one etymology for different etyma, and finally semantic overpermissiveness are discussed. — 2006