Breadcrumb Home > Dictionary > Index K knotweed: Meaning and Definition of Find definitions for: knot•weed Pronunciation: (not'wēd"), [key] — n. any of several knotty-stemmed plants belonging to the genus Polygonum, of the buckwheat family. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. knotty rhatany knout ✖ Related Content Daily Word Quiz: guilloche Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language