单词	horseweed
释义	horseweed noun horse·​weed ˈhȯrs-ˌwēd  1 : a common annual American composite herb (Conyza canadensis synonym Erigeron canadensis) with an erect usually hairy stem and small discoid heads of yellow disk flowers 2 : a coarse annual North American ragweed (Ambrosia trifida) Example Sentences Recent Examples on the Web Some examples are sharp point fluvellin, velvetleaf, puncturevine, horseweed, western bittercress and oxalis. OregonLive.com, 27 Feb. 2018 Yet tolerance to 2,4-D has already been documented in several weed species that have elsewhere become glyphosate-resistant superweeds, including waterhemp and horseweed. Brandon Keim, WIRED, 24 June 2014 Word History First Known Use 1790, in the meaning defined at sense 1
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