ragweed

American  

[rag-weed] / ˈrægˌwid /

noun

1. any of the composite plants of the genus Ambrosia, the airborne pollen of which is the most prevalent cause of autumnal hay fever, as the common North American species, A. trifida great ragweed, or giant ragweed and A. artemisiifolia.

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ragweed British  

/ ˈræɡˌwiːd /

noun

1. Also called: ambrosia.  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

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Etymology

Origin of ragweed

First recorded in 1650–60; rag ¹ + weed ¹, so called from its ragged appearance

Example Sentences

"The things that survive and probably diversify will of course be the rats and the ragweed and the cockroaches ... unless some really concerted work is done to ameliorate some of the most extreme forces."

From Salon

The most allergenic tree pollens are from birch, cypress, Japanese cedar, latex, grass, and ragweed.

From Salon

At the same time, pollen records show an increase in ragweed, a shrub known to proliferate in disturbed landscapes.

From Science Daily

Three tablets treat grass or ragweed allergies, and a fourth gained approval in 2017 for dust mite allergies.

From Salon

Important wetlands along the reservoir, including the Velyki and Mali Kuchuhury archipelago, will suffer from desiccation, and ecologists are concerned that invasive plants, such as ragweed and goldenrod, will colonize newly exposed sediment.

From Science Magazine

Related Words

• antigen
• dander
• irritant
• pollen