sunflower

noun6

1. •
   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 flowers glowed red and golden: snapdragons and sunflowers, and nasturtians trailing all over the turf walls and peeping in at the round windows. — 1954
2. •
   The commonly cultivated species, Helianthus annuus, a native of America.
3. •
   A bright yellow, like that of the flower petals.
4. •
   (UK) An Automatic Warning System (AWS) indicator in the driver's cab that is displayed after a driver has acknowledged an audible warning, which consists of a yellow circle enclosing a white circle, with black spokes overlaid.
5. •
   (informal) Any flat, radially symmetric organic compound, such as coronene.
6. •
   Synonym of worm-star.