ghost word

noun1

1. •
   A fictitious or erroneous word, originally meaningless (not used in practice), that has been published in a dictionary or similarly authoritative reference work or otherwise listed as genuine, generally as the result of misinterpretation, misreading, or typographical error.

   • 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