[美]宾夕法尼亚州(Pennsylvania)的别称

[ noun ]
a Mid-Atlantic state; one of the original 13 colonies
<noun.location>

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.]