pinkweed
/ˈpɪŋkwiːd/noun
Either of two plants of the genus Polygonum: (a) knotgrass, P. aviculare ( English regional ( northern ) in later use); (b) US smartweed, P. pennsylvanicum.
Origin
Mid 17th century; earliest use found in William Coles (1626–1662), botanist. From pink + weed.
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