Dictionary of Difficult Words - spectrum
spectrum
n. (pl. -ra) series of images, colours, etc., formed when ray of radiant energy is dispersed into its component parts. spectrobolograph, n. photogographic record of lines of infra-red spectrum. spectrogram, n. representation of a spectrum. spectrograph, n. instrument showing spectrum. spectroheliogram, n. photograph made by spectroheliograph. spectroheliograph, n. instrument that photographs light of a particular wavelength from sun to show details of sun's surface. spectrorohelioscope, n. instrument for making spectroheliographic observations of sun. spectorology, n. chemical analysis by means of spectrum. spectrometer, n. instrument measuring refractive indices, and wave-lengths of rays of a spectrum. spectroscope, n. instrument for forming spectrum by dispersing ray. spectroscopy, n. production and study of spectra.
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