[informal] grandpa, [informal] grandad, US [informal] grandaddy [noun] [C] - the father of a person's mother or father(formal) How are you, Grandfather? [as form of address]A grandfather clock is a tall clock in a wooden case which stands on the floor, and is usually larger than a person.See picture: Clocks and watches
GRANDFATHER
Meaning of GRANDFATHER in English
Cambridge English vocab. Кембриджский английский словарь. 2012