/ Dictionary / Index R root knot: Meaning and Definition of Find definitions for: root' knot" Pronunciation: [key] — Plant. Pathol. a disease of plants, characterized by galls or knots on the roots and stunted growth, caused by any of several nematodes of the genus Meloidogyne. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rooti rootless Related Content Daily Word Quiz: sequester Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language