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单词 ray
释义
ray
Physics

  • A narrow beam of radiation or an idealized representation of such a beam on a ray diagram, which can be used to indicate the positions of the object and image in a system of lenses or mirrors.

Mathematics

  • A synonym for half-line.

Science and Technology

  • 1. A narrow beam of radiation.

    2. A flattened, cartilaginous fish with greatly enlarged pectoral fins, eyes on the upper side of the body, the wide mouth and gill slits on the lower side. The rays, related to sharks, form the order Rajiformes, comprising five families. Rays occur in all oceans.

    Mike Allaby

Biology

  • 1. (in optics) A narrow beam of radiation.

    2. (in botany) See medullary ray.

    3. (in zoology)

    a. A bony or horny skeletal element in the fin of a bony fish (class Osteichthyes).

    b. Any of an order (Rajiformes) of cartilaginous fishes with flattened bodies.
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