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The Collaborative International Dictionary
Subesophageal

Subesophageal \Sub*e`so*phag"e*al\, a. (Zo["o]l.) Situated beneath the esophagus. [Written also sub[oe]sophageal.]

Subesophageal ganglion (Zo["o]l.), a large special ganglion situated beneath the esophagus of arthropods, annelids, and some other invertebrates.

Wiktionary
subesophageal

a. (context anatomy English) Situated beneath the esophagus.