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color index

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noun Astronomy.

the difference between the apparent photographic magnitude and the apparent visual magnitude of a star.
the difference between the magnitudes of a star in any two spectral regions.

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Nearby words

  1. color filter,
  2. color force,
  3. color guard,
  4. color hearing,
  5. color hemianopsia,
  6. color line,
  7. color of someone's money, see the,
  8. color phase,
  9. color radical,
  10. color scheme

Origin of color index

First recorded in 1920–25
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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