An example of tauto used as a prefix is the word tautologous, meaning repeating the same thing.
Origin of tauto
- Gr < tauto < to auto, the same
From Webster's New World College Dictionary, 5th Edition
- Greek from tauto the same contraction of to auto to the to- in Indo-European roots auto neuter of autos same, self
From American Heritage Dictionary of the English Language, 5th Edition