megaesophagus

noun

mega·​esoph·​a·​gus

variants or chiefly British megaoesophagus

-i-ˈsäf-ə-gəs 

plural megaesophagi -ˌgī  -ˌjī 

: dilation and hypertrophy of the lower portion of the esophagus

megaesophagus secondary to advanced achalasia

—Suil Kim et al.