One of the radiating branches of an umbel;
(In Compositae/Asteraceae) the limb of a ray floret.
In the sunflower family: the ligulate, or strap-shaped, marginal flowers on the head, as opposed to the central regular flowers.
In the parsley family: one of the primary branches of an umbel or similar inflorescence.
A pedicel within an umbel, a ray flower or its corolla.
The marginal flowers of a composite head, especially when different from the rest, and diverging. The pedicels of an umbel.
A line of light, radiation or heat.
One of several lines diverging from a common center.
A ray is a line of light or heat that originates from a single source, spreading outwards from a central point. Topics such as alpha, beta, and gamma rays are discussed in relation to radium.