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spectrumMain Entry: spec·trum Pronunciation: \ˈspek-trəm\ Function: noun Inflected Form(s): plural spec·tra \-trə\ or spectrums Etymology: New Latin, from Latin, appearance — more at specter Date: 1671 1 a : 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 b : any of various continua that resemble a color spectrum in consisting of an ordered arrangement by a particular characteristic (as frequency or energy): as (1) : electromagnetic spectrum (2) : radio spectrum (3) : the range of frequencies of sound waves (4) : mass spectrum c : the representation (as a plot) of a spectrum
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