• WordNet 3.6
    • n coltsfoot 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
    • n coltsfoot 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
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Webster's Revised Unabridged Dictionary
    • n Coltsfoot (Bot) A perennial herb (Tussilago Farfara), whose leaves and rootstock are sometimes employed in medicine.
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Century Dictionary and Cyclopedia
    • n coltsfoot The popular name of the Tussilago Farfara, natural order Compositæ, a plant of Europe and Asia, now naturalized in the United States, the leaves of which were once much employed in medicine. The name is given from the shape of the leaf. The wild ginger, Asarum Canadense, is also sometimes known as coltsfoot, as is, in the West Indies, Piper peltatum. Also called ass's-foot.
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In literature:

And Coltsfoot was a good farm when I was a girl.
"The Judge" by Rebecca West
Take of the Roots of Coltsfoot, Fennel and Fearn each four Ounces.
"The Closet of Sir Kenelm Digby Knight Opened" by Kenelm Digby
Sometimes coltsfoot was mixed with tobacco.
"The Social History of Smoking" by G. L. Apperson
Before a dandelion has shown in the meadow, the banks of the railway are yellow with coltsfoot.
"Nature Near London" by Richard Jefferies
Coltsfoot, my dear, and horehound, with plenty of sugar, boiled together; and a little mallow won't hurt.
"The Maidens' Lodge" by Emily Sarah Holt
The song died away under the leaves of the coltsfoot.
"The Adventures of Maya the Bee" by Waldemar Bonsels
Coltsfoot, too, was but a penny to the stick and pleased the palate.
"Chimney-Pot Papers" by Charles S. Brooks
The caterpillar feeds on the flower stalks of the coltsfoot during March and April.
"Butterflies and Moths" by William S. Furneaux
Some of the worst weeds to get out are Goutweed and Coltsfoot.
"Wood and Garden" by Gertrude Jekyll

In poetry:

Come you, Coltsfoot, Mousetail, come!
Come I know where, far away,
Owls there be whom age makes numb;
Come and tease them till the day.
"A Lover's Quarrel Among the Fairies" by William Butler Yeats