parablepsy
/ˈparəblɛpsi/noun
Scribal oversight, especially the erroneous assimilation of the spelling of a word to that of another in the text; an instance of this. Chiefly in relation to the editing of old, especially classical, texts.
Origin
Mid 19th century (in an earlier sense). From Hellenistic Greek παράβλεψις parablepsis + -y.