grandson
n. countable A1 Beginner US //ˈɡɹændˌsən// UK //ɡɹˈændsʌn// grand·son
n. the son of your son or daughter. You are this person's grandfather or grandmother.
n. a male grandchild; the son of one's son or daughter.
My grandson visits me every Sunday afternoon.
The elderly man proudly showed everyone a photograph of his newborn grandson.
She spent the entire summer teaching her grandson how to tend the garden, passing down skills her own father had taught her decades earlier.
From grand- + son.