Monongahela mononeural • mononitrate · · · Info · Definitions · Characters · · Monongahela · · Text Latin · · Script 11 · · Length Definitions · · · (noun) 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. Synonyms: Monongahela River. · · Noun Definition 1 Characters · · M latin capital letter m U+004D a latin small letter a U+0061 e latin small letter e U+0065 g latin small letter g U+0067 h latin small letter h U+0068 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F