dandelion

from WordNet (r) 3.0 (2006)

dandelion
    n 1: any of several herbs of the genus Taraxacum having long tap
         roots and deeply notched leaves and bright yellow flowers
         followed by fluffy seed balls [syn: {dandelion},
         {blowball}]

from 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]