senecio (s??ni?????) n, pl -cios (Plants) any plant of the genus Senecio, including groundsels, ragworts, and cineraria: family Asteraceae (composites)Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014