| NOUN | plant | common ragweed, Ambrosia artemisiifolia | annual weed with finely divided foliage and spikes of green flowers |
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| Meaning | annual weed with finely divided foliage and spikes of green flowers; common in North America; introduced elsewhere accidentally. | |
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| Synonym | Ambrosia artemisiifolia | |
| Broader | ragweed, ambrosia, bitterweed | Any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma |
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