Princeton's WordNet

1. dandelion, blowball(noun)

   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

Kernerman English Learner's Dictionary

1. dandelion(noun)ˈdæn dlˌaɪ ən

   a common weed with yellow flowers

Wiktionary

1. dandelion(Noun)

   Any of the several species of plant in the genus Taraxacum, characterised yellow flower heads and notched, broad-ended leaves, especially the common dandelion (Taraxacum officinale).

2. dandelion(Noun)

   The flower head or fruiting head of the dandelion plant.

3. dandelion(Adjective)

   Of a yellow colour, like that of the flower.

Webster Dictionary

1. Dandelion(noun)

   a well-known plant of the genus Taraxacum (T. officinale, formerly called T. Dens-leonis and Leontodos Taraxacum) bearing large, yellow, compound flowers, and deeply notched leaves

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