noun \ˈspek-trəm\
plural spec·tra \-trə\ or spectrums

Definition of SPECTRUM

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 spectrum in consisting of an ordered arrangement by a particular characteristic (as frequency or energy): as (1) : electromagnetic spectrum (2) : mass spectrum c : the representation (as a plot) of a spectrum
: a continuous sequence or range; specifically : a range of effectiveness against pathogenic organisms <an antibiotic with a broad spectrum>

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