| 单词 | ragweed |
| 释义 | ragweed (once / 53970 pages) n WORD FAMILY ragweed: ragweeds USAGE EXAMPLESThat's probably because of ragweed, the biggest allergy trigger in the fall. US News(Oct 18, 2016) You also might spot a small, older house set back from the road, nearly hidden by giant ragweeds. Washington Times(Sep 04, 2016) The company will halt work on grass and ragweed allergy treatments and concentrate efforts on asthma and respiratory products. The Guardian(Jun 20, 2016) 1n any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma Syn|Hypo|Hyper ambrosia, bitterweed Ambrosia artemisiifolia, common ragweed annual weed with finely divided foliage and spikes of green flowers; common in North America; introduced elsewhere accidentally Ambrosia trifida, great ragweeda coarse annual with some leaves deeply and palmately three-cleft or five-cleft Ambrosia psilostachya, perennial ragweed, western ragweedcoarse perennial ragweed with creeping roots of dry barren lands of southwestern United States and Mexico weed any plant that crowds out cultivated plants 2n widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity Syn|Hyper Senecio jacobaea, benweed, ragwort, tansy ragwort weed any plant that crowds out cultivated plants |
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