Search Result for "thistledown": 
Wordnet 3.0

NOUN (1)

1. pappus of a thistle consisting of silky featherlike hairs attached to the seed-like fruit of a thistle; 



WordNet (r) 3.0 (2006):

thistledown
    n 1: pappus of a thistle consisting of silky featherlike hairs
         attached to the seed-like fruit of a thistle