The Collaborative International Dictionary of English v.0.48:

Circumesophagal \Cir`cum*e*soph"a*gal\, a. [Pref. circum- +
   esophagal.] (Anat.)
   Surrounding the esophagus; -- in (Zool.) said of the nerve
   commissures and ganglia of arthropods and mollusks.
   [1913 Webster]