Spectrum

spek′trum, n. the image of something seen continued after the eyes are closed: the colours of light separated by a prism, and exhibited as spread out on a screen:— pl. Spec′tra .— n. Spec′trograph , an apparatus for photographing a spectrum.— adjs. Spectrograph′ic , -al .— n. Spectrog′raphy , the art of using the spectrograph.— adj. Spectrolog′ical .— adv. Spectrolog′ically .— ns. Spectrol′ogy , the division of physical science that embraces spectrum analysis: demonology; Spectrom′eter , an instrument like a spectroscope, by means of which the angular deviation of a ray of light in pa ing through a prism can be accurately measured.— adj. Spectromet′ric .— n. Spec′trophōne , an adaptation of the spectroscope, in which, on the principle of the radiophone, perception of a succe ion of sounds takes the place of observation by the eye.— adj. Spec trop hon′ic .— ns. Spec′tro-polar′iscope , a polariscope combined with a spectroscope; Spec′troscope , an instrument for forming and examining spectra of luminous bodies, so as to determine their composition.— adjs. Spectroscōp′ic , -al .— adv. Spectroscōp′ically .— ns. Spec′troscōpist , one skilled in spectroscopy; Spec′troscōpy , the use of the spectroscope and the study of spectrum analysis. [L.,— specĕre , to see.]