sunflower
noun
°Any plant of the genus Helianthus, so called probably from the form and color of its floral head, having the form of a large disk surrounded by yellow ray flowers; the commonly cultivated sunflower is Helianthus annuus, a native of America.
°(colour) a bright yellow, like that of the flower petals.
adjective
°(colour) of a bright yellow, like that of the flower.