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单词 pleochroic halo
释义

Definition of pleochroic halo in English:

pleochroic halo

noun
Mineralogy
  • A spherical shell of colour surrounding and produced by a radioactive inclusion in certain minerals, manifesting in section as a ring or halo; usually in plural.

Origin

Late 19th century; earliest use found in The Naturalist.

Definition of pleochroic halo in US English:

pleochroic halo

noun
Mineralogy
  • A spherical shell of colour surrounding and produced by a radioactive inclusion in certain minerals, manifesting in section as a ring or halo; usually in plural.

Origin

Late 19th century; earliest use found in The Naturalist.

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