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allegheny river is a noun meaning "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". It carries one recorded sense.
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
Definitions, synonyms and semantic relations for allegheny river come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.