(spectra, or ~s)
1.
The ~ is the range of different colours which is produced when light passes through a glass prism or through a drop of water. A rainbow shows the colours in the ~.
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2.
A ~ is a range of a particular type of thing.
Politicians across the political ~ have denounced the act...
The term ‘special needs’ covers a wide ~ of problems.
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3.
A ~ is a range of light waves or radio waves within particular frequencies.
Vast amounts of energy, from X-rays right through the ~ down to radio waves, are escaping into space...
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