Definition of senecio
: any of a large genus (Senecio) of widely distributed composite plants that have alternate or basal leaves and flower heads usually with yellow ray flowers
Origin of senecio
New Latin, from Latin, old man, groundsel (from its hoary pappus), from sen-, senic-, senex old man
First Known Use: 1562
Medical Definition of senecio
1 capitalized : a genus of widely distributed plants (family Compositae) including some containing various alkaloids which are poisonous to livestock
2plural se·ne·cios : any plant of the genus Senecio
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Medical Dictionary: Definition of "senecio"
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