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Rainbow :: Rainbow (n.) A bow or arch exhibiting, in concentric bands, the several colors of the spectrum, and formed in the part of the hemisphere opposite to the sun by the refraction and reflection of the sun's rays in drops of falling rain..

Yellow :: Yellow (n.) A bright golden color, reflecting more light than any other except white; the color of that part of the spectrum which is between the orange and green..

Ultrared :: Ultrared (a.) Situated beyond or below the red rays; as, the ultrated rays of the spectrum, which are less refrangible than the red..

Caesium :: Caesium (n.) A rare alkaline metal found in mineral water; -- so called from the two characteristic blue lines in its spectrum. It was the first element discovered by spectrum analysis, and is the most strongly basic and electro-positive substance known. Symbol Cs. Atomic weight 132.6..

Indium :: Indium (n.) A rare metallic element, discovered in certain ores of zinc, by means of its characteristic spectrum of two indigo blue lines; hence, its name. In appearance it resembles zinc, being white or lead gray, soft, malleable and easily fusible, but in its chemical relation it resembles aluminium or gallium. Symbol In. Atomic weight, 113.4..

White :: White (superl.) Reflecting to the eye all the rays of the spectrum combined; not tinted with any of the proper colors or their mixtures; having the color of pure snow; snowy; -- the opposite of black or dark; as, white paper; a white skin..

Aberration :: Aberration (n.) The convergence to different foci, by a lens or mirror, of rays of light emanating from one and the same point, or the deviation of such rays from a single focus; called spherical aberration, when due to the spherical form of the lens or mirror, such form giving different foci for central and marginal rays; and chromatic aberration, when due to different refrangibilities of the colored rays of the spectrum, those of each color having a distinct focus..

Spectral :: Spectral (a.) Of or pertaining to the spectrum; made by the spectrum; as, spectral colors; spectral analysis..

Gadolinium :: Gadolinium (n.) A supposed rare metallic element, with a characteristic spectrum, found associated with yttrium and other rare metals. Its individuality and properties have not yet been determined..

Yellow :: Yellow (superl.) Being of a bright saffronlike color; of the color of gold or brass; having the hue of that part of the rainbow, or of the solar spectrum, which is between the orange and the green..

Green :: Green (superl.) Having the color of grass when fresh and growing; resembling that color of the solar spectrum which is between the yellow and the blue; verdant; emerald.

Red :: Red (superl.) Of the color of blood, or of a tint resembling that color; of the hue of that part of the rainbow, or of the solar spectrum, which is furthest from the violet part..

Fraunhofer Lines :: Fraunhofer lines () The lines of the spectrun; especially and properly, the dark lines of the solar spectrum, so called because first accurately observed and interpreted by Fraunhofer, a German physicist..

Spectrum :: Spectrum (n.) An apparition; a specter.

Spectrophotometer :: Spectrophotometer (n.) An instrument for measuring or comparing the intensites of the colors of the spectrum.

Microspectroscope :: Microspectroscope (n.) A spectroscope arranged for attachment to a microscope, for observation of the spectrum of light from minute portions of any substance..

Violet :: Violet (n.) The color of a violet, or that part of the spectrum farthest from red. It is the most refrangible part of the spectrum..

Fluted :: Fluted (a.) Decorated with flutes; channeled; grooved; as, a fluted column; a fluted ruffle; a fluted spectrum..

Spectrology :: Spectrology (n.) The science of spectrum analysis in any or all of its relations and applications.

Ultraviolet :: Ultraviolet (a.) Lying outside the visible spectrum at its violet end; -- said of rays more refrangible than the extreme violet rays of the spectrum.

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