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Definition of horseweed :
A composite plant ( Erigeron Canadensis), which is a common weed.
Synonyms:
Collinsonia Canadensis,
stone root,
clearweed,
Conyza canadensis,
Erigeron canadensis,
feabane mullet,
stoneroot,
Canadian Fleabane,
richweed,
fleabane,
horse balm,
dead nettle