from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of several plants of the very large genus Senecio in the composite family, having yellow flower heads, especially S. aureus of eastern North America. S. jacobaea, a European species poisonous to livestock, is widely naturalized in North America.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of a number of wild flowering plants with yellow flowers in the family Asteraceae, mostly belonging to Senecio and related genera.
from the GNU version of the Collaborative International Dictionary of English
- n. A name given to several species of the composite genus Senecio.
from The Century Dictionary and Cyclopedia
- n. The name of several plants of the genus Senecio; primarily, S. Jacobæa of Europe and northern Asia.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. American ragwort with yellow flowers
- n. widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity
From the ragged shape of its leaves.(American Heritage® Dictionary of the English Language, Fourth Edition)
From rag + wort. (Wiktionary)