n. The markedly reduced sepals of an Asteraceae floret that take the form of trichomes or scale attached to the ovary or seed.
the GNU version of the Collaborative International Dictionary of English
n. The hairy or feathery appendage of the achenes of thistles, dandelions, and most other plants of the order Compositæ; also, the scales, awns, or bristles which represent the calyx in other plants of the same order.
The Century Dictionary and Cyclopedia
n. Down, as that on the seeds of some plants.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. calyx composed of scales or bristles or featherlike hairs in plants of the Compositae such as thistles and dandelions
Word Usage
"Dandelion has what is called a "pappus" attached to its seed, rather similar to the feathery tail of the Traveller's Joy."