opaque
  • adjective referring to something that does not allow light or other rays to pass through it
  • A body, material, or medium which does not pass radiant energy, such as light, or sound.
  • A body, material, or medium which does not pass one form of radiant energy, such as ultraviolet light, but passes others, such as visible light.
  • A body, material, or medium which does not pass one type of particle, such as ions, but passes others, such as photons.

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