small intestine smal·lin·tes·tine uncommon noun 1. the longest part of the alimentary canal; where digestion is completed Synonymssmall intestine Related words Broader terms intestine Narrower terms duodenumjejunumileum Parts alimentary canal Part of ileal arteryjejunal artery WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
