aerophagia

noun

aero·​pha·​gia ˌar-ō-ˈfā-j(ē-)ə, ˌer- 

variants also aerophagy

ˌa(-ə)r-ˈäf-ə-jē, ˌe(-ə)r- 

plural aerophagias also aerophagies

: the swallowing of air especially in hysteria