Where does “oesophagismus” come from?

oesophagismus (English) comes from English œsophagus, 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.

oesophagismus (English): oesophageal spasm