mar·co po·lo sheep \ˈmärˌkōˈpōˌlō-, ˈmȧˌk-\noun ormarco polo's sheep Usage: usually capitalized M&P Etymology: after Marco Polo died 1324? Italian traveler : an Asiatic wild sheep with exceptionally large horns that is considered to be a variety (Ovis ammon poli) of the argali or to constitute a distinct species (O. poli)