/ Thesaurus / T Synonyms of test tube Find synonyms for: Noun1. test tube, tube, tubingusage: glass tube closed at one endWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: grimace Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language