ray

A beam of light or radiation.

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

(zoology) One of the spheromeres of a radiate, especially one of the arms of a starfish or an ophiuran.

(botany) 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.

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

(mathematics) A line extending indefinitely in one direction from a point.

(colloquial) A tiny amount.