black root

black root
noun
1. : any of several plants or their dark-colored roots: as
a. : a perennial plant (Pterocaulon undulatus) of the southern United States that has large black rootstocks
c. : colicroot 1
d. : a common comfrey (Symphytum officinale) with the upper part of the stem and inflorescence densely hispid
2. : any of several plant diseases characterized by dark discoloration of roots: as
b. : a disease of radishes, beets, and sugar beets caused by fungi (genus Aphanomyces) and producing brown or black lesions on the roots, deformation of the roots, and a damping off of seedlings

Useful english dictionary. 2012.

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