/ Dictionary / Index T thistle tube: Meaning and Definition of Find definitions for: this'tle tube" Pronunciation: [key] a glass funnel consisting of a long narrow tube with a thistle-shaped head. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. thistledown thistly Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language