1. a river that rises in northern West Virginia and flows north into Pennsylvania where it joins the Allegheny River at Pittsburgh to form the Ohio River; [syn: Monongahela, Monongahela River]
WordNet (r) 3.0 (2006):
Monongahela River
n 1: a river that rises in northern West Virginia and flows
north into Pennsylvania where it joins the Allegheny River
at Pittsburgh to form the Ohio River [syn: Monongahela,
Monongahela River]