Great-grandparent
Full definition of great-grandparent
Noun
great-grandparent
(plural great-grandparents)- A parent of a grandparent.
Usage notes
Additional instances of "great-" can be prepended to the term, each indicating one further generation of ancestry. For large numbers of generations a number can be substituted, for example, "four-greats grandparent" or "four-times-great-grandparent".