Ragweed definitions

răg'wēd'
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.
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Ragwort.
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Any of a genus (Ambrosia) of chiefly North American plants of the composite family, having tassel-like, greenish flowers which yield large amounts of wind-borne pollen, a major cause of hay fever.
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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.
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Ragwort.
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A plant of the genus Ambrosia. These weeds are particularly noted for producing pollen which people with hay fever are allergic to.
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Origin of ragweed

From the ragged shape of its leaves