- (mathematics) A line extending indefinitely in one direction from a point.
- (obsolete) Array; order; arrangement; dress.
- (zoology) A rib-like reinforcement of bone or cartilage in a fish's fin.
- (obsolete) Sight; perception; vision; from an old theory of vision, that sight was something which proceeded from the eye to the object seen.
- The name of the letter ⟨/⟩, one of two which represent the r sound in Pitman shorthand.
- A beam of light or radiation.
"I saw a ray of light through the clouds."
- (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.
- (colloquial) A tiny amount.
"Unfortunately he didn't have a ray of hope."
- A marine fish with a flat body, large wing-like fins, and a whip-like tail.
- (music) Alternative form of re
- (zoology) One of the spheromeres of a radiate, especially one of the arms of a starfish or an ophiuran.
- (intransitive) To radiate as if in rays
- (now rare) To dress, array (someone). [from 14th c.]
- (transitive) To emit something as if in rays.
- (obsolete) To arrange. [14th-18th c.]
- (obsolete) To stain or soil; to defile. [16th-19th c.]