n. | 1. | Any plant of the genus Helianthus; - so called probably from the form and color of its flower, which is large disk with yellow rays. The commonly cultivated sunflower is Helianthus annuus, a native of America. |
Noun | 1. | sunflower - any plant of the genus Helianthus having large flower heads with dark disk florets and showy yellow rays Synonyms: helianthus |