Mus·king·um River 
(mə-skĭngəm, -gəm)
(mə-skĭngəm, -gəm) A river of eastern Ohio flowing about 180 km (110 mi) south and southeast to the Ohio River at Marietta.
- protohistorian
- protohistoric
- protohistory
- protohuman
- Proto-Indo-European
- protolanguage
- protolithic
- protomartyr
- protomorph
- protomorphic
- proton
- protonema
- protonemal
- protonematal
- protonic
- protonotary
- protonotary
- protonotary apostolic
- proton-proton chain
- proton pump inhibitor
- proton synchrotron
- proto-oncogene
- protopathic
- protopathy
- protoplanet