Colts·foot n. Bot. A perennial herb (Tussilago Farfara), whose leaves and rootstock are sometimes employed in medicine.
 Butterbur coltsfoot Bot., a European plant (Petasites vulgaris).
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 Tussilago farfara
      n : perennial herb with large rounded leaves resembling a colt's
          foot and yellow flowers appearing before the leaves do;
          native to Europe but now nearly cosmopolitan; used
          medicinally especially formerly [syn: coltsfoot]