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wild lettuce

noun
  1. any of various uncultivated species of lettuce, growing as weeds in fields and waste places, especially a North American species, Lactuca canadensis.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for wild lettuce

wild lettuce

noun
  1. any of several uncultivated lettuce plants, such as Lactuca serriola (or L. scariola) of Eurasia and L. canadensis (horseweed) of North America, which grow as weeds and have yellow or blue flowers, milky juice in the stem, and prickly leaves: family Asteraceae (composites)
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012