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WordNet (r) 3.0 (2006) (WordNet)

pigweed
n 1: common weedy European plant introduced into North America;
often used as a potherb [synonym: {lamb's-quarters}, {pigweed},
{wild spinach}, {Chenopodium album}]
2: leaves sometimes used as potherbs; seeds used as cereal;
southern United States to Central America; India and China
[synonym: {pigweed}, {Amaranthus hypochondriacus}]
3: leaves collected from the wild [synonym: {lamb's-quarter},
{pigweed}, {wild spinach}]