Source : Webster's Revised Unabridged Dictionary (1913)

Coltsfoot \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}).

Source : WordNet®

coltsfoot
     n 1: tufted evergreen perennial herb having spikes of tiny white
          flowers and glossy green round to heart-shaped leaves
          that become coppery to maroon or purplish in fall [syn:
          {galax}, {galaxy}, {wandflower}, {beetleweed}, {Galax
          urceolata}]
     2: 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: {Tussilago farfara}]