/ Dictionary / Index R Russian thistle: Meaning and Definition of Find definitions for: Rus'sian this'tle Pronunciation: [key] a saltwort, Salsola kali tenuifolia, that has narrow, spinelike leaves, a troublesome weed in the central and western U.S. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Russian Soviet Federated Socialist Republic Russian Turkestan. Related Content Daily Word Quiz: acerbity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language