noun, plural granddaddies. Informal.

1760–70; grand- + daddy Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
grandad, granddad, grandaddy or granddaddy (ˈɡrænˌdæd, ˈɡrænˌdædɪ)
n , pl -dads, -daddies
informal words for grandfather
granddad, granddad, grandaddy or granddaddy
grandaddy, granddad, grandaddy or granddaddy
granddaddy, granddad, grandaddy or granddaddy

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
AM radio is the granddaddy of wireless telecommunications hot-shots.
If there was a granddaddy of earmarks, he would be it.
Trapshooting is the granddaddy of the clay target shooting sports.
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