gran.dad grand.dad 5grAn7dAd n [C] infml for GRANDFATHER 祖父;外公 Watch me ride my bike, Grandad. [as form of address] 看我骑自行车，爷爷。 Grandad can also be used rudely or humorously to address an old man. 用来粗鲁或幽默地称呼老人 Come on, grandad! [as form of address] 来吧，老头！