1. plural of ragweed; weedy plants of the genus Ambrosia that produce large amounts of pollen and commonly cause hay fever

Examples

• Ragweeds are among the most common causes of seasonal allergies.
• The field was overrun with ragweeds and other unwanted plants.
• Many people suffer from hay fever when ragweeds release their pollen in late summer.
• The gardener worked to remove all the ragweeds from the flower bed.
• Ragweeds can grow quickly and spread throughout neglected areas.
• Common ragweeds produce millions of pollen grains per plant each season.