Definition of "great-grandparent" [great-grandparent]
A parent of a grandparent.(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "great-grandparent" in a sentence
"Overall, 17 percent of the medicines ingested belonged to a grandparent or great-grandparent."
"There are tables and oddments of the depressing sort we can all remember shudderingly from the house of a grandparent or great-grandparent, which remind us why later generations decried the Victorian aesthetic."
"Ms. SANDWEISS: One-eighth, one great-grandparent of African descent."