Wiktionary
n. The father of someone's great-grandparent.
Usage examples of "great-great-grandfather".
This was the tomb of Hezekiah Pendergast, his own great-great-grandfather.
The only family relics he had inherited and still owned were the collection of leatherbound family journals, the laboriously hand-written records of his ancestors from the arrival of his great-great-grandfather in Africa over a hundred years before.
It is carved from the tusks of Old Mlima, the oliphaunt who bore my great-great-grandfather to war against the Tigrati insurrection.
Raised by hand from a clutch of eggs old Paisley's great-great-grandfather Cuchuli found beside Hob's Chimbley one fine morning.
If the line of descent was direct, in other words if he wasn't a cousin or an uncle, then he would be my great- or great-great-grandfather.
Lord Kellos and Trisu's great-great-grandfather did some horsetrading back and forth over the exact boundaries of our holdings, and Lord Rathman gave us the exemption in return for a couple of offsetting concessions from Lord Kellos.
My great-great-grandfather was one of the whaling Macyssometimes I think my career is penance for what he didand he saw the collapse coming in whale oil and put all his money in petroleum.