-an(t)thəs noun
Etymology: New Latin, from heli- (I) + -anthus
1. capitalized : a genus of tall erect or sometimes much-branched American annual or perennial herbs (family Compositae) comprising the sunflowers and having flower heads with purple or yellow disk flowers and showy yellow sterile rays — see jerusalem artichoke
2. -es : any plant of the genus Helianthus