Definitions of blackroot:
- noun: Either of two species in the genus Pterocaulon: Pterocaulon pycnostachyum and Pterocaulon virgatum
- noun: Culver's root, Veronicastrum virginicum
- noun: Colicroot, Aletris farinosa
- noun: Several plant diseases caused by fungi in the genus Aphanomyces that cause roots to rot and turn black.
(Definitions from Wiktionary)
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