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Definition of Allegheny
1. Noun. A river that rises in Pennsylvania and flows north into New York and then back south through Pennsylvania again to join the Monongahela River at Pittsburgh which is the beginning of the Ohio River.
Exact synonyms: Allegheny River
Group relationships: Empire State, New York, New York State, Ny, Keystone State, Pa, Pennsylvania
Generic synonyms: River
Group relationships: Empire State, New York, New York State, Ny, Keystone State, Pa, Pennsylvania
Generic synonyms: River
Definition of Allegheny
1. a. Of or pertaining to the Allegheny Mountains, or the region where they are situated. Also