Entry 1 sense Webster, 1913 Coronule /(k?r"?-n?l)/ · Cor·o·nule · IPA 01 n. A coronet or little crown of a seed; the downy tuft on seeds. See Pappus. 1. A coronet or little crown of a seed; the downy tuft on seeds. See Pappus.(Bot.) See: Pappus