sunflower

/ˈsʌnˌflaʊə/
noun
  1. 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.

  2. 2

    A bright yellow, like that of the flower petals.

  3. 3

    Any flat, radially symmetric organic compound such as coronene

Source: https://en.wiktionary.org/wiki/sunflower