• (a.) Surrounding the esophagus; -- in Zool. said of the nerve commissures and ganglia of arthropods and mollusks.
Cir`cum·e·soph'a·gal adjective [ Prefix circum- + esophagal .] (Anat.) Surrounding the esophagus; -- in Zoology said of the nerve commissures and ganglia of arthropods and mollusks. 
circumesophagal In zoology, surrounding the esophagus; a reference to the nerve commissures and ganglia of arthropods and mollusks.