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esoph·a·go·my·ot·o·my
variants:
or chiefly British oesophagomyotomy \ -mī-ˈät-ə-mē 
\
\ plural esophagomyotomies
Medical Definition of esophagomyotomy
: incision through the musculature of the esophagus and especially the distal part (as for the relief of esophageal achalasia)
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