Allegheny

American  

[al-i-gey-nee] / ˌæl ɪˈgeɪ ni /

noun

1. 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 miles (525 km) long.

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Other Word Forms

• Alleghanian
  adjective
• Alleghenian
  adjective
• trans-Alleghenian
  adjective

Example Sentences

The Pirates have been a perpetual laughingstock ever since Barry Bonds ditched the Allegheny for the San Francisco Bay after leading Pittsburgh to the National League Championship Series in 1992.

From The Wall Street Journal • Apr. 9, 2026

Allegheny County put $42.5 million into the build.

From Slate • Nov. 24, 2025

Where I’m from, everybody who is Black in our city has a reference point to the Allegheny County Jail, which is in the middle of Pittsburgh.

From Los Angeles Times • Apr. 17, 2025

“If the climate is changing, and changing kind of rapidly, we have to develop potatoes that are adapted to the new climate,” Walter DeJong, a professor at Cornell University, told The Allegheny Front.

From Salon • Mar. 4, 2025

Still, coal miners in the Allegheny and Kiskiminetas river valleys, a region rich with natural resources, seemed stuck in poverty.

From "Fannie Never Flinched" by Mary Cronk Farrell