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]