noun Botany.
- one of the marginal florets surrounding the disk of tubular florets in the flower heads of certain composite plants, as the daisy.
- One of the narrow flowers, resembling single petals, that surround the central disk in the capitulum or flower cluster of a plant of the composite family (Asteraceae or Compositae), such as the daisy or sunflower. Rays are often male flowers with sterile stamens. Also called ray ray floret