American Heritage® Dictionary of the English Language, Fourth Edition
- n. Any of various weeds of the genus Ambrosia having small, greenish, unisexual flower heads and producing abundant pollen that is one of the chief causes of hay fever.
- n. Chiefly British Ragwort.
Century Dictionary and Cyclopedia
- n. Any plant of the composite genus Ambrosia; especially, the common North American species A. trifida, the great ragweed or horse-cane, and A. artemisiæfolia, the Roman wormwood or hogweed. Both are sometimes called
bitterweed. The former is commonly found on river-banks, has three-lobed leaves, and is sometimes 12 feet high. The latter, a much-branching plant from 1 to 3 feet high, with dissected leaves, grows everywhere in waste places, along roads, etc., and is troublesome in fields. Its pollen is regarded as a cause of hay-fever. The plants of this genus are monœcious, the flowers of the two sexes borne in separate heads, the female heads producing a single flower with the ovoid involucre closed over it. The flowers are greenish and inconspicuous. See Ambrosia, 2.
- n. The ragwort or St.-James-wort, Senecio Jacobæa.
- n. A plant of the genus Ambrosia. These weeds are particularly noted for producing pollen which people with hay fever are allergic to.
GNU Webster's 1913
- n. (Bot.) A common American composite weed (Ambrosia artemisiæfolia) with finely divided leaves; hogweed.
- n. any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma
- n. widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity
- rag + weed (Wiktionary)
- From the ragged shape of its leaves. (American Heritage® Dictionary of the English Language, Fourth Edition)
“If you're allergic to other plants, such as ragweed, your risk of an allergic reaction to Calendula may be greater.”
“Old field plant communities are composed primarily of successional species such as ragweed, asters, goldenrod, sumac, wild carrot and various grasses.”
“Cetirizine Hydrochloride syrup is indicated for the relief of symptoms associated with seasonal allergic rhinitis due to allergens such as ragweed, grass and tree pollens in adults and children 2 years of age and older.”
“In spring, for example, tree pollens make their presence felt most strongly during morning hours, whereas allergens such as ragweed tend to do their damage in the middle of the day during the fall season.”
“Since response to allergens such as ragweed occurs quickly not only in the nose but also in the sinuses, "you can try treatment before exposure," he said.”
“The extreme change in humidity and temperature bring on a flurry of allergens such as ragweed, dust and mold.”
“The fall brings new allergy triggers that are not prevalent in the spring, such as ragweed, according to the foundation.”
“Laws, inserted by chapter 163 of the acts of 1949, is hereby etc'amende'd. amended by inserting after the word "ragweed" in lines 2 and 4, in each instance, the words: —, goldenrod and poison ivy, — so as to read as follows: — (36A) For acquiring information regarding the growth of amhorw fo?”
“Tree season usually lasts from mid-February through April, grass season occurs from May to early July, and late summer brings weeds such as ragweed, which last until the first solid freeze.”
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