Word: keystone
Part of speech: Noun
Syllables: key
stone
Definition: A native or resident of the American state of Pennsylvania.
Morphemes:
Affix: key
Language: en
PoS: Noun
Meaning: A keystone; the central building block at the top of an arch or vault
Affix: stone
Language: en
PoS: Adjective
Meaning: Of a dull light grey or beige, like that of some stones.