[chry.san.the.mum] n [L, fr. Gk chrysanthemon, fr. chrys- + anthemon flower; akin to Gk anthos flower] (1551) 1: any of various composite plants (genus Chrysanthemum) including weeds, ornamentals grown for their brightly colored often double flower heads, and others important as sources of medicinals and insecticides
2: a flower head of an ornamental chrysanthemum