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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.

onent elements of the total radiation from a body; any definite or limited portion of the spectrum; as, the red ray; the violet ray. See Illust. under Light.

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. "Fresh flowers, white and reede." Chaucer. Your color, I warrant you, is as red as any rose. Shak.

he provisional name ekaboron by means of the periodic law, and subsequently discovered by spectrum analysis in certain rare Scandinavian minerals (euxenite and gadolinite). It has not yet been isolated. Symbol Sc. Atomic weight 44

Of or pertaining to the spectrum; made by the spectrum; as, spectral colors; spectral analysis. Spectral lemur. (Zoöl.) See Tarsius.

combination of spectroscope and bolometer for determining the distribution of energy in a spectrum. --Spec`tro*bo`lo*met"ric (#), a.

A photograph, map, or diagram of a spectrum.

An apparatus for photographing or mapping a spectrum.

The science of spectrum analysis in any or all of its relations and applications.

Art or process of using the spectrometer, or of measuring wave lengths of rays of a spectrum. -- Spec`tro*met"ric (#), a.

An instrument constructed on the principle of the photophone and used in spectrum analysis as an adjunct to the spectroscope. -- Spec`tro*phon"ic (#), a.

An instrument for measuring or comparing the intensites of the colors of the spectrum.

l waters. The thermal condition of the earth. J. D. Forbes. Thermal conductivity, Thermal spectrum. See under Conductivity, and Spectrum. -- Thermal unit (Physics), a unit chosen for the comparison or calculation of quantities of heat. The unit most commonly employed is the amount of heat necessary to raise the temper…

Situated beyond or below the red rays; as, the ultrated rays of the spectrum, which are less refrangible than the red.

Lying outside the visible spectrum at its violet end; -- said of rays more refrangible than the extreme violet rays of the spectrum.

computed that the frequency of the undulations corresponding to the several colors of the spectrum ranges from 458 millions of millions per second for the extreme red ray, to 727 millions of millions for the extreme violet, and their lengths for the same colors, from the thirty-eight thousandth to the sixty thousandth…

f several species of harmless tropical American bats of the genus Vampyrus, especially V. spectrum. These bats feed upon insects and fruit, but were formerly erroneously supposed to suck the blood of man and animals. Called also false vampire. Vampire bat (Zoöl.), a vampire, 3.

The color of a violet, or that part of the spectrum farthest from red. It is the most refrangible part of the spectrum.

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 Ant: black or dark; as, white paper; a white skin. "Pearls white." Chaucer. White as the whitest lily on a stream. Longfellow.…

f 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. Her yellow hair was browded [braided] in a tress. Chaucer. A sweaty reaper from his tillage brought First fruits, the green ear and the yellow sheaf. Milton. The line of yellow…