Allegheny(redirected from Allegheny (disambiguation))
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Al•le•ghe•ny(ˌæl ɪˈgeɪ ni)
a river flowing NW from Pennsylvania into SW New York and then S through W Pennsylvania, joining the Monongahela at Pittsburgh to form the Ohio River. 325 mi. (525 km) long.
Al`le•ghe′ni•an, Al`le•gha′ni•an, adj.
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|Noun||1.||Allegheny - 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|