Definition of pigweed
: any of various vigorous weedy plants especially of the goosefoot or amaranth families
Recent Examples of pigweed from the Web
One red root pigweed plant can produce 100,000 seeds that can continue to germinate over the next 15 to 20 years.
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First Known Use of pigweed
Medical Definition of pigweed
: any of several plants of the genus Amaranthus (as A. retroflexus and A. hybridus) with pollen that acts as a hay fever allergen
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