Definition of ragweed
: any of various chiefly North American weedy composite herbs (genus Ambrosia) that produce highly allergenic pollen
Recent Examples of ragweed from the Web
The idea is to keep pollen, ragweed and other allergens from entering your nose and setting off symptoms.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'ragweed.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
First Known Use of ragweed
RAGWEED Defined for English Language Learners
Definition of ragweed for English Language Learners
: any one of a group of North American plants that release a lot of pollen into the air and that can cause allergic reactions in some people
RAGWEED Defined for Kids
Definition of ragweed for Students
: a common weed with pollen that irritates the eyes and noses of some people
Medical Definition of ragweed
: any of various chiefly North American weedy herbaceous plants comprising the genus Ambrosia and producing highly allergenic pollen responsible for much hay fever and asthma: asa: an annual weed (A. artemisiifolia) with finely divided foliage that is common on open or cultivated ground in much of North Americab: a coarse annual (A. trifida) with some or all of the leaves usually deeply and palmately 3-cleft or 5-cleft—called also great ragweed
Seen and Heard
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