ragweed

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rag·weed / ˈragˌwēd/ • n. a North American plant (Ambrosia artemisia) of the daisy family. Its tiny green flowers produce copious amounts of pollen, making it a major causative agent of hay fever.

ragweed

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ragweed XVII, ragwort XV. f. RAG1 + WEED1, WORT1; with ref. to the ragged form of the leaves.