pig·​weed | \ ˈpig-ˌwēd How to pronounce pigweed (audio) \

Definition of pigweed

: any of various vigorous weedy plants especially of the goosefoot or amaranth families

Examples of pigweed in a Sentence

Recent Examples on the Web Ultimately, Roundup was no match for the pigweed’s evolutionary vitality. New York Times, 11 Aug. 2021 Then, once applications of Roundup annihilated all the weeds in a field except the resistant Palmer amaranth, the pigweed could spread without competition. New York Times, 11 Aug. 2021 Peppers and Pigweed Leafminers preferred both pigweed (also called amaranthus) and ragweed to pepper plants in a study at the Coastal Plains Experiment Station in Tifton, Georgia. The Editors, Good Housekeeping, 24 Apr. 2020 Some farmers who plant dicamba-tolerant soybeans and cotton say dicamba's use during the height of the growing season is their only defense against pigweed, an invasive plant that has mutated and has become resistant to glyphosate herbicides. Stephen Steed, Arkansas Online, 20 Dec. 2019 The Palmer amaranth, a type of pigweed that was originally native to the deserts of Mexico and the southwestern U.S., can out-compete most commercial crops, is highly resistant to common herbicides and can be toxic to livestock. Gregory B. Hladky, courant.com, 12 Aug. 2014 Terrance Hurley Department of Applied Economics University of Minnesota Adler’s characterization of ragweed and pigweed (Palmer amaranth) as monsters is plain silly. The Editors, Scientific American, 1 Sep. 2011 The scientists are testing the machine on a range of species, including pigweed. Brooke Borel, Scientific American, 18 June 2018 Weed scientist Muthu Bagavathiannian had no trouble finding herbicide-resistant pigweed, which can produce up to a million seeds per plant compared to cotton’s 200 to 300. Lynn Brezosky, San Antonio Express-News, 5 July 2018 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'pigweed.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of pigweed

circa 1801, in the meaning defined above

Learn More About pigweed

Time Traveler for pigweed

Time Traveler

The first known use of pigweed was circa 1801

See more words from the same year

Dictionary Entries Near pigweed



pigweed family

See More Nearby Entries 

Statistics for pigweed

Cite this Entry

“Pigweed.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pigweed. Accessed 23 May. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More Definitions for pigweed


pig·​weed | \ ˈpig-ˌwēd How to pronounce pigweed (audio) \

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

More from Merriam-Webster on pigweed

Britannica.com: Encyclopedia article about pigweed


Test Your Vocabulary

Name That Food

  • a-light
  • Name these cookies!
Spell It

Can you spell these 10 commonly misspelled words?

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!