pigweed

pig·weed

[pig-weed]
noun
1.
any goosefoot of the genus Chenopodium, especially C. album.
2.
any of certain amaranths, as Amaranthus retroflexus.

Origin:
1795–1805; pig1 + weed1

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
pigweed (ˈpɪɡˌwiːd) [Click for IPA pronunciation guide]
 
n
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 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Pigweed is always a great word to know.
So is flibbertigibbet. Does it mean:
a chattering or flighty, light-headed person.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
Encyclopedia Britannica
Encyclopedia

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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