Meaning

• A beam of light or radiation.

  "I saw a ray of light through the clouds."

• A rib-like reinforcement of bone or cartilage in a fish's fin.

• One of the spheromeres of a radiate, especially one of the arms of a starfish or an ophiuran.

• A radiating part of a flower or plant; the marginal florets of a compound flower, such as an aster or a sunflower; one of the pedicels of an umbel or other circular flower cluster; radius.

• Sight; perception; vision; from an old theory of vision, that sight was something which proceeded from the eye to the object seen.

• A line extending indefinitely in one direction from a point.

• A tiny amount.

  "Unfortunately he didn't have a ray of hope."

Meaning

• To emit something as if in rays.

• To radiate as if in rays.