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Ragweed definition

răgwēd
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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(chiefly british) 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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(chiefly british) 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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Other Word Forms

Noun

Singular:
ragweed
Plural:
ragweeds

Origin of ragweed

  • From the ragged shape of its leaves

    From American Heritage Dictionary of the English Language, 5th Edition

  • rag +"Ž weed

    From Wiktionary

Ragweed 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.

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Words near ragweed in the Dictionary