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)

Examples of horseweed in a Sentence

Recent Examples on the Web

Other native plant enemies include sow thistle; dandelions, which spread clouds of seeds once their cheerful yellow flowers dry up; tall bulky horseweed; round-leaved cheeseweed; purslane; and spurge, which blanket the ground like thick green doilies. —Los Angeles Times, 13 June 2022

But after glyphosate-resistant crops had a few years to grow, farmers began to notice horseweed and morning glory and other weeds encroaching once more into their fields. —Carl Zimmer, Discover Magazine, 4 May 2010

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