| 释义 |
ragweed
rag·weed R0022700 (răg′wēd′)n.1. 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.2. Chiefly British Ragwort.
[From the ragged shape of its leaves.]ragweed (ˈræɡˌwiːd) n (Plants) any plant of the chiefly North American genus Ambrosia, such as A. artemisiifolia (common ragweed): family Asteraceae (composites). Their green tassel-like flowers produce large amounts of pollen, which causes hay fever. Also called: ambrosia rag•weed (ˈrægˌwid)
n. any of the composite plants of the genus Ambrosia, the airborne pollen of which is the most prevalent cause of autumnal hay fever. [1650–60; so called from its ragged appearance] Thesaurus| Noun | 1. |  ragweed - widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantitybenweed, ragwort, Senecio jacobaea, tansy ragwortgenus Senecio, Senecio - enormous and diverse cosmopolitan genus of trees and shrubs and vines and herbs including many weedsweed - any plant that crowds out cultivated plants | | 2. |  ragweed - any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthmaambrosia, bitterweedgenus Ambrosia - comprising the ragweeds; in some classification considered the type genus of a separate family AmbrosiaceaeAmbrosia artemisiifolia, common ragweed - annual weed with finely divided foliage and spikes of green flowers; common in North America; introduced elsewhere accidentallyAmbrosia trifida, great ragweed - a coarse annual with some leaves deeply and palmately three-cleft or five-cleftAmbrosia psilostachya, perennial ragweed, western ragweed - coarse perennial ragweed with creeping roots of dry barren lands of southwestern United States and Mexicoweed - any plant that crowds out cultivated plants |
Translations
ragweed
ragweedslang Marijuana, especially that of cheap, inferior quality. I caught Tommy smoking ragweed out back with his friends. Next time you're buying, splash out and get some decent pot, because this shitty ragweed is just awful.ragweed n. inferior marijuana. (Drugs.) Bart just sells ragweed except to his friends. ragweed
ragweed, any plant of the genus Ambrosia, coarse, weedy herbs belonging to the family Asteraceae (asteraster
[Gr.,=star], common name for the Asteraceae (Compositae), the aster family, in North America, name for plants of the genus Aster, sometimes called wild asters, and for a related plant more correctly called China aster (Callistephus chinensis
..... Click the link for more information. family), most of which are native to America. They have inconspicuous greenish flowers and soft subdivided leaves. Ragweeds are regarded as especially troublesome because their pollen is acknowledged as the primary cause of hay fever—especially the pollen of A. artemisiifolia (common ragweed) and A. trifida (great ragweed), the two most prevalent species in North America. The leaves of the common ragweed were formerly used as an astringent and hemostatic; they sometimes impart a bitter taste to milk if eaten by cattle. One variety (elatior) of this species has become widely naturalized in Europe. Ragweeds are classified in the division MagnoliophytaMagnoliophyta
, division of the plant kingdom consisting of those organisms commonly called the flowering plants, or angiosperms. The angiosperms have leaves, stems, and roots, and vascular, or conducting, tissue (xylem and phloem).
..... Click the link for more information. , class Magnoliopsida, order Asterales, family Asteraceae.  ragweed ragweedCommon allergen. Goldenrod is often blamed because it blooms right next to ragweed, but goldenrod is actually the antidote! Ragweed is all green, sometimes greyish-silver-green. Has distinct finger-like leaves with erect seed-pod spikes. Although many are allergic to ragweed, it is used by others for conditions like nausea, intestinal cramps, menstrual cramps and stroke. (tea from leaves and root) Highly astringent (stops bleeding). Seeds could be used as porridge or cereal.ragweed
ragweed (răg′wēd′)n.1. 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.2. Chiefly British Ragwort.ragweed A plant of the family Compositae, the pollen from which is highly allergenic and the most common cause of allergic rhinitis.
Diagnosis
Bronchial provocation testing, in which pollen is inhaled through a dosimeter.
Management
Avoidance of pollens by staying indoors; use of cromolyn, antihistamines, sympathomimetics, theophylline and corticosteroids.ragweed Ambrosia artemisiifolia Allergy medicine Any of the weedy composite herbs of family Compositae, the pollen from which is highly allergenic Diagnosis Bronchial provocation testing, in which pollen is inhaled through a dosimeter Management Avoid pollen, stay indoors, cromolyn, antihistamines, sympathomimetics, theophylline, corticosteroids Drug slang A street term for low quality marijuana or heroinragweed
Synonyms for ragweednoun widespread European weed having yellow daisylike flowersSynonyms- benweed
- ragwort
- Senecio jacobaea
- tansy ragwort
Related Wordsnoun any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthmaSynonymsRelated Words- genus Ambrosia
- Ambrosia artemisiifolia
- common ragweed
- Ambrosia trifida
- great ragweed
- Ambrosia psilostachya
- perennial ragweed
- western ragweed
- weed
|