/ Thesaurus / G Synonyms of gastrointestinal system Find synonyms for: Noun1. digestive system, gastrointestinal system, systema alimentarium, systema digestorium, systemusage: the system that makes food absorbable into the bodyWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: chicory Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language