/ˈgrænpeərənt ||; ˈgrænˌpɛrənt/(also grandmothergrandfather) noun [C] the mother or father of one of your parents 祖母；祖父；外祖母；外祖父: This is a picture of two of my great-grandparents (= the parents of one of my grandparents). 这是一张我的（外）曾祖父母的照片。 If you need to make it clear which grandparent you are talking about you can say: My maternal/paternal grandfather or my mother's/father's father. 如果要区分祖父母和外祖父母，可以说my maternal／paternal grandfather（我的外祖父╱祖父）或my mother's／father's father（我的外祖父╱祖父）。