granddaddy

noun

grand·​dad·​dy ˈgran-ˌda-dē 

variants or less commonly grandaddy

1

: grandfather sense 1a

2

: one that is the first, earliest, or most venerable of its kind

Synonyms

• ancestor
• forerunner
• predecessor

Examples of granddaddy in a Sentence

the granddaddy of all English mystery novels

Recent Examples on the Web

Both the jitterbug and Lindy Hop (which is often referred to as the granddaddy of the swing era dances) are lively, energetic swing dances that involve quick spins, sharp footwork and pure joy between a pair to a booming live band playing. —Alexa Stone updated October 21, Kansas City Star, 21 Oct. 2025

In the south of France this weekend, the granddaddy of fashion prizes—The Hyères International Festival of Fashion, Photography, and Accessories—marked its 40th anniversary by showcasing talents from around the world. —Vogue, 20 Oct. 2025

Bill and his granddaddy wait as the police officer arrives. —Janine Rubenstein, PEOPLE, 9 Oct. 2025

Kentucky goblins: 'The granddaddy of UFO stories': 70 years later, Kentucky 'green men' encounter endures Reporter Josh Wood contributed. —Marina Johnson, Louisville Courier Journal, 18 Sep. 2025

Word History

First Known Use

1648, in the meaning defined at sense 1

Rhymes for granddaddy

• addy
• caddie
• caddy
• daddy
• gaddi
• laddie
• paddy