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spectrum

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noun
  • (usu sing) image of a band of colours as seen in a rainbow (and usu described as red, orange, yellow, green, blue, indigo and violet), formed by a ray of light that has passed through a prism [Barron]
  • a continuum of color formed when a beam of white light is dispersed (as by passage through a prism) so that its component wavelengths are arranged in order [Taisha]

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Wiktionary:
spectrum @ wiktionary
WordNet:
spectrum @ wordnet.princeton.edu
Merriam-Webster Online:
spectrum @ M-W.com
MSN Encarta:
spectrum @ Encarta
American Heritage Dictionary of the English Language:
spectrum @ AHD provided by Yahoo! Education
Answers.com:
spectrum @ Answers.com
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