keystone state
NounWordNet 3.0
Noun (1)
- a Mid-Atlantic state; one of the original 13 coloniesSynonyms: PennsylvaniaKeystone StatePA
Webster's Dictionary (GCIDE)
Keystone State \Key"stone` State\ Pennsylvania; -- a nickname alluding to its having been the central one of the 13 original United States, at the time of formation of the Constitution. [Webster 1913 Suppl.]