erigeron (??r?d??r?n; -?r??-) n (Plants) any plant of the genus Erigeron, whose flowers resemble asters but have narrower rays: family Asteraceae (composites). See also fleabane1[C17: via Latin from Greek, from ?ri early + ger?n old man; from the white down characteristic of some species]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014e?rig?er?on (??r?d? ??r?n, -?r ?n) n. any composite plant of the genus Erigeron, having asterlike flower heads but with narrower and usu. more numerous white or purple rays. [1595?1605;