nipplewort

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nip·ple·wort

 (nĭp′əl-wûrt′, -wôrt′)
n.
An annual plant (Lapsana communis) in the composite family, native to Eurasia and naturalized in North America, having small yellow flower heads.

[From its former use in folk medicine to treat breast tumors.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

nipplewort

(ˈnɪpəlˌwɜːt)
n
(Plants) an annual Eurasian plant, Lapsana communis, with pointed oval leaves and small yellow flower heads: family Asteraceae (composites)
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
The gentle LAPSANA, NYMPHAEA fair, And bright CALENDULA with golden hair, Watch with nice eye the Earth's diurnal way, Marking her solar and sidereal day, Her slow nutation, and her varying clime, And trace with mimic art the march of Time; Round his light foot a magic chain they fling, And count the quick vibrations of his wing.
Nemoral species include Aegopodium podagraria L., Glechoma hederacea L., Lapsana communis L., Viola mirabilis L., and others.