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Noun: grandaddy  'gran,da-dee
  1. [N. Amer] The father of your father or mother
    - grandfather, gramps, granddad, grandad, granddaddy, grandpa, grandpapa [archaic]
     
  2. The first, or best, most important, or largest example of a particular thing
    - granddaddy

Derived forms: grandaddies

Type of: grandparent

Encyclopedia: Grandaddy