grand·dad·dy also gran·dad·dy 
(grăndăd′ē)
(grăndăd′ē)n. pl. grand·dad·dies also gran·dad·dies
Informal
Informal
1. A grandfather.
2. One that is the first, oldest, or most respected of its kind: the granddaddy of modern computers.
- uncertainness
- uncertainty
- uncertainty principle
- uncertified
- unchain
- unchainable
- unchallengeable
- unchallengeably
- unchangeability
- unchangeable
- unchangeableness
- unchangeably
- unchanging
- unchangingly
- unchangingness
- uncharacteristic
- uncharacteristically
- uncharged
- uncharitable
- uncharitableness
- uncharitably
- uncharted
- unchaste
- unchastely
- unchastity