Etymology
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grandad (n.)

also granddad, 1793, from grand- + dad. Grand dada attested from 1690s. Grandaddy is attested from 1751; figuratively (in grandaddy of all _____) from 1898.

updated on April 13, 2015

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Definitions of grandad from WordNet

grandad (n.)
the father of your father or mother;
Synonyms: grandfather / gramps / granddad / granddaddy / grandpa
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.