Sun·flow·er n. 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.
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Helianthus annuus
n : annual sunflower grown for silage and for its seeds which
are a source of oil; common throughout United States and
much of North America [syn: common sunflower, mirasol]