Wiktionary
great-great-grandmother
n. The mother of someone’s great-grandparent.
Usage examples of "great-great-grandmother".
Master Li swore that the insult had last been delivered during the Usurpation of Wang Mang, and he was willing to bet that at some point in her wanderings Grief of Dawn had found work in one of the moldy priories where antiquated old maids preserve ancient sayings and customs they learned from their great-great-grandmothers.