a weedy composite plant, Taraxacum officinale, having edible, deeply toothed or notched leaves, golden-yellow flowers, and rounded clusters of white, hairy seeds.
any other plant of the genus Taraxacum.

1505–15; < Middle French, alteration of dent de lion, literally, tooth of (a) lion, translation of Medieval Latin dēns leōnis, in allusion to the toothed leaves

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World English Dictionary
dandelion (ˈdændɪˌlaɪən)
1.  a plant, Taraxacum officinale, native to Europe and Asia and naturalized as a weed in North America, having yellow rayed flowers and deeply notched basal leaves, which are used for salad or wine: family Asteraceae (composites)
2.  any of several similar related plants
[C15: from Old French dent de lion, literally: tooth of a lion, referring to its leaves]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1513, from M.Fr. dent de lion, lit. "lion's tooth" (from its toothed leaves), transl. of M.L. dens leonis. Other folk names, like tell-time refer to the custom of telling the time by blowing the white seed (the number of puffs required to blow them all off supposedly being the number of the hour), or
to the plant's more authentic diuretic qualities, preserved in M.E. piss-a-bed and Fr. pissenlit.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Quick and easy recipes for fresh dandelion greens, one of our favorite spring
After seeding a bare plot of land with dandelion seeds, the population of
  dandelions increases quickly.
Anxiety free-floating, along with dandelion fluff, in the air.
Picked wild in the spring and steamed, they lose their sting and are as tasty
  as dandelion greens.
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