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  1. Oxford Dictionary

    extraordinary ray

    • n.
      (in double refraction) the light ray that does not obey the ordinary laws of refraction.

    • noun: extraordinary ray, plural noun: extraordinary rays

    • 更多解釋

    extraordinary ray

    • IPA[ikˈstrôrdnˌerē]
    • n.
      (in double refraction) the light ray that does not obey the ordinary laws of refraction.

    Oxford American Dictionary