Definition of thistledown noun from the Oxford Advanced American Dictionary

 

thistledown

 noun
noun
NAmE//ˈθɪslˌdaʊn//
 
[uncountable]
 
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a very light soft substance that contains thistle seeds and is blown from thistles by the wind as light as thistledown
See the Oxford Advanced Learner's Dictionary entry: thistledown