单词 | ray |
释义 | ray 1 ![]() n. 1. a. A narrow stream of radiant energy, especially visible light, traveling in a straight or nearly straight line. b. A narrow stream of particles such as protons traveling in a straight or nearly straight line. c. A rapidly moving particle traveling in a straight or nearly straight line. d. rays Sunshine: Let's go to the beach and catch some rays. 2. A small amount; a trace: not a ray of hope left. 3. Mathematics A straight line extending from a point. Also called half-line. 4. A structure or part having the form of a straight line extending from a point, such as: a. Any of the bright streaks that are seen radiating from some craters on the moon. b. A ray flower or the strap-shaped portion of the corolla of a ray flower. c. A branch of an umbel. d. One of the bony spines supporting the membrane of a fish's fin. e. One of the arms of a starfish or other radiate animal. tr.v. rayed, ray·ing, rays 1. To send out as rays; emit. 2. To supply with rays or radiating lines. 3. To cast rays on; irradiate. [Middle English rai, from Old French, from Latin radius, pointed stick, spoke, radius of a circle, ray of light (from the representation of rays of light as spearlike shafts), of unknown origin.] |
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