/ Thesaurus / C Synonyms of capillary tube Find synonyms for: Noun1. capillary, capillary tube, capillary tubing, tube, tubingusage: a tube of small internal diameter; holds liquid by capillary actionWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: devout Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language