noun Plant Pathology.
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.
Origin of root knot
First recorded in 1885–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for root knot
On light, sandy soils a fairly good crop may be made, but on such soils, wilt and root-knot are dangerous foes.Agriculture for Beginners|Charles William Burkett
Science definitions for root knot
A disease of plants characterized by protuberant swellings on the roots caused by infestation with nematodes.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.