WordReference Random House Unabridged Dictionary of American English © 2020
club•root  (klubro̅o̅t′, -rŏŏt′),USA pronunciation n. 
  1. Plant Diseasesa disease of cabbage and other cruciferous plants, characterized by enlarged, malformed roots, caused by a slime mold, Plasmodiophora brassicae.
  • club + root1 1840–50

Collins Concise English Dictionary © HarperCollins Publishers::
club root n
  1. a disease of cabbages and related plants, caused by the fungus Plasmodiophora brassicae, in which the roots become thickened and distorted

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