Ragweed definitions

răg'wēd'
Any of various weeds of the genus Ambrosia of the composite family, having small, greenish, unisexual flower heads and producing abundant pollen that is one of the chief causes of hay fever.
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Ragwort.
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Any of a genus (Ambrosia) of chiefly North American plants of the composite family, having tassel-like, greenish flowers which yield large amounts of wind-borne pollen, a major cause of hay fever.
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Any of various weeds of the genus Ambrosia of the composite family, having small, greenish, unisexual flower heads and producing abundant pollen that is one of the chief causes of hay fever.
noun
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Ragwort.
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A plant of the genus Ambrosia. These weeds are particularly noted for producing pollen which people with hay fever are allergic to.
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Origin of ragweed

From the ragged shape of its leaves

Sentence Examples

  • The trees which form dense forest and scrub in southern Patagonia and in Fuegia are absent, and one of the largest plants on the islands is a gigantic woolly ragweed (Senecio candicans) which attains in some places a height of 3 to 4 ft..

  • Last year, glyphosate-resistant common ragweed was confirmed in Missouri, which was also resistant to 10 times the normal rate of application.

  • In Hawaii, short ragweed (Ambrosia artemisiifolia L.) is reported to be present in a number of locations.

  • ragweed dermatitis, and parthenium dermatitis are all produced.

  • ragweed pollen.

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Words near ragweed in the Dictionary