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The Collaborative International Dictionary of English v.0.48:

Blackroot \Black"root`\, n. (Bot.) See Colicroot. [1913 Webster]
The Collaborative International Dictionary of English v.0.48:

Colicroot \Col"ic*root`\, n. A bitter American herb of the Bloodwort family, with the leaves all radical, and the small yellow or white flowers in a long spike (Aletris farinosa and Aletris aurea). Called sometimes star grass, blackroot, blazing star, and unicorn root. [1913 Webster]