Formal:
* Bisnonna: This is the most common and formal way to say "great grandma" in Italian. It literally translates to "great-grandmother."
Informal:
* Bisnonna: This is also used informally, but it's more common to use diminutives like:
* Bisnonnina: (little great-grandmother)
* Nonnina: (little grandmother) - While not technically meaning "great grandma," this is often used colloquially to refer to a great-grandmother, especially by younger generations.
Regional variations:
* Bisavola: In some regions of Italy, especially in the south, "bisavola" is used instead of "bisnonna."
* Nonna bisnonna: This is a more literal translation of "great grandmother," and it is sometimes used.
Ultimately, the best way to say "great grandma" in Italian depends on the context and your relationship with the person.