megaesophagus
noun
mega·esoph·a·gus
variants:
or chiefly British megaoesophagus \ -i-ˈsäf-ə-gəs 
\
\
plural megaesophagi\ -ˌgī
, -ˌjī
\
, -ˌjī
\
Medical Definition of megaesophagus
: dilation and hypertrophy of the lower portion of the esophagus
megaesophagus secondary to advanced achalasia— Suil Kim et al