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WordNet

blowball

n. 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]

The Collaborative International Dictionary

Blowball

Blowball \Blow"ball`\, n. The downy seed head of a dandelion, which children delight to blow away.
--B. Jonson.

Wiktionary

blowball

n. The downy seed head of a dandelion, a dandelion clock.