Where does “megaesofago” come from?

megaesofago (Italian) comes from Italian esofago, from Ancient Greek οἰσοφάγος, from Ancient Greek οἰσέμεν, from Ancient Greek φέρω, from Proto-Hellenic pʰérō, from Proto-Indo-European bʰéreti, from Proto-Indo-European bʰēr- — shiny, light brown.

megaesofago (Italian): megaoesophagus