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pigweed

[pig-weed] /ˈpɪgˌwid/
noun
1.
any goosefoot of the genus Chenopodium, especially C. album.
2.
any of certain amaranths, as Amaranthus retroflexus.
Origin
1795-1805
1795-1805; pig1 + weed1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for pigweed

pigweed

/ˈpɪɡˌwiːd/
noun
1.
Also called redroot. any of several coarse North American amaranthaceous weeds of the genus Amaranthus, esp A. retroflexus, having hairy leaves and green flowers
2.
a US name for fat hen
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for pigweed

any of several coarse annual plants of cosmopolitan distribution that are often troublesome weeds. Several of them belong to the genus Amaranthus, of the family Amaranthaceae. Prostrate pigweed, or mat amaranth (A. graecizans), grows along the ground surface with stems rising at the tips; spiny pigweed, or spiny amaranth (A. spinosus), has spines at the base of the leafstalks; and rough pigweed, or redroot (A. retroflexus), is a stout plant up to 3 metres (about 10 feet) tall.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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14
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