Entry 1 sense Webster, 1913 Stomatogastric · Stom·a·to·gas·tric · IPA 01 a. Of or pertaining to the mouth and the stomach; as, the stomatogastric ganglion of certain Mollusca. 1. Of or pertaining to the mouth and the stomach; as, the stomatogastric ganglion of certain Mollusca.