"ragwort" in the noun sense
1. ragwort, tansy ragwort, ragweed, benweed, Senecio jacobaea
widespread European weed having yellow daisylike flowers sometimes an obnoxious weed and toxic to cattle if consumed in quantity
2. butterweed, ragwort, Senecio glabellus
American ragwort with yellow flowers
Source: WordNet® (An amazing lexical database of English)
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