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The Collaborative International Dictionary
Coronule

Coronule \Cor"o*nule\ (k?r"?-n?l), n. [L. coronula, dim. of corona crown.] (Bot.) A coronet or little crown of a seed; the downy tuft on seeds. See Pappus.
--Martyn.

Wiktionary
coronule

n. (context botany English) A coronet or little crown of a seed; the downy tuft on seeds.