stepgrandmother noun2 •The stepmother of one's father or mother and the wife of one's grandfather, usually a woman that one's grandfather marries after the divorce of one's grandparents or the death of one's grandmother. •The mother of one's stepmother or stepfather.The president’s elderly stepgrandmother brought him an oxtail fly whisk, a mark of power at home in Kenya. — 2009 formsstepgrandmothers
