From Longman Dictionary of Contemporary Englishgranddadgrand‧dad /ˈɡrændæd/ noun [countable] SSFFAMILYthe usual American spelling of grandad
Examples from the Corpus
granddad• Now I am a happy dad and granddad.• Some early skinheads went awry & wore tie-dyed granddad vests.• And finally Don't forget granddad - remember he's a father too!• My granddad, who smoked like a chimney and lived to 97, was lucky enough never to encounter a promoter. 