The Collaborative International Dictionary of English v.0.48:
Dandelion \Dan"de*li`on\, n. [F. dent de lion lion's tooth, fr. L. dens tooth + leo lion. See Tooth, n., and Lion.] (Bot.) A well-known plant of the genus Taraxacum (Taraxacum officinale, formerly called Taraxacum Dens-leonis and Leontodos Taraxacum) bearing large, yellow, compound flowers, and deeply notched leaves. [1913 Webster]