1. [N. Amer, informal] Informal term for grandfather
   "The children loved visiting their grandaddy on the farm";
   - grandfather, gramps [informal], granddad [informal], grandad [informal], granddaddy [informal], grandpa [informal], gramp [informal], grampy [informal], grandpapa [archaic]
    
2. The first, or best, most important, or largest example of a particular thing
   "That old oak is the grandaddy of all the trees in the forest";
   - granddaddy [informal]

Derived forms: grandaddies

Type of: grandparent

Encyclopedia: Grandaddy