Where does “gastro-œsophagien” come from?

gastro-œsophagien (French) comes from French œsophagien, from French œsophage, 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.

gastro-œsophagien (French): Gastro-esophageal; gastro-oesophageal;...