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English definition of “grandad”

grandad

noun [C] uk (also granddad)   /ˈɡræn.dæd/ informal us  
A2 a grandfather: My grandad was a coal miner. [as form of address] Do you want a cup of tea, Grandad?Names people call their close relatives used rudely or humorously to address an old man: Come on, grandad!Friendly and unfriendly terms of address
(Definition of grandad from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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