/ Dictionary / Index J Japanese knotweed: Meaning and Definition of Find definitions for: Jap'anese knot'weed. Pronunciation: [key] See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Japanese ivy Japanese lacquer Related Content Daily Word Quiz: bungled Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language