English-Thai Dictionary

spectrum

N สเป็กทรั่ม  แถบ สี หลายหลาก สี  color spectrum chromatic spectrum rainbow sa-pek-tam

 

Webster's 1828 Dictionary

SPECTRUM

n.[L.] A visible form; an image of something seen, continuing after image of something seen, continuing after the eyes are closed, covered or turned away. This is called an ocular spectrum.

 

Webster's 1913 Dictionary

SPECTRUM

Spec "trum, n.; pl. Spectra. Etym: [L. See Specter. ]

 

1. An apparition; a specter. [Obs. ]

 

2. (Opt. ) (a ) The several colored and other rays of which light is composed, separated by the refraction of a prism or other means, and observed or studied either as spread out on a screen, by direct vision, by photography, or otherwise. See Illust. of Light, and Spectroscope. (b ) A luminous appearance, or an image seen after the eye has been exposed to an intense light or a strongly illuminated object. When the object is colored, the image appears of the complementary color, as a green image seen after viewing a red wafer lying on white paper. Called also ocular spectrum. Absorption spectrum, the spectrum of light which has passed through a medium capable of absorbing a portion of the rays. It is characterized by dark spaces, bands, or lines. -- Chemical spectrum, a spectrum of rays considered solely with reference to their chemical effects, as in photography. These, in the usual photogrophic methods, have their maximum influence at and beyond the violet rays, but are not limited to this region. -- Chromatic spectrum, the visible colored rays of the solar spectrum, exhibiting the seven principal colors in their order, and covering the central and larger portion of the space of the whole spectrum. -- Continous spectrum, a spectrum not broken by bands or lines, but having the colors shaded into each other continously, as that from an incandescent solid or liquid, or a gas under high pressure. -- Diffraction spectrum, a spectrum produced by diffraction, as by a grating. -- Gaseous spectrum, the spectrum of an incandesoent gas or vapor, under moderate, or especially under very low, pressure. It is characterized by bright bands or lines. -- Normal spectrum, a representation of a spectrum arranged upon conventional plan adopted as standard, especially a spectrum in which the colors are spaced proportionally to their wave lengths, as when formed by a diffraction grating. -- Ocular spectrum. See Spectrum, 2 (b ), above. -- Prismatic spectrum, a spectrum produced by means of a prism. -- Solar spectrum, the spectrum of solar light, especially as thrown upon a screen in a darkened room. It is characterized by numerous dark lines called Fraunhofer lines. -- Spectrum analysis, chemical analysis effected by comparison of the different relative positions and qualities of the fixed lines of spectra produced by flames in which different substances are burned or evaporated, each substance having its own characteristic system of lines. -- Thermal spectrum, a spectrum of rays considered solely with reference to their heating effect, especially of those rays which produce no luminous phenomena.

 

New American Oxford Dictionary

spectrum

spec trum |ˈspektrəm ˈspɛktrəm | ▶noun ( pl. spectra |-trə | ) 1 a band of colors, as seen in a rainbow, produced by separation of the components of light by their different degrees of refraction according to wavelength. • (the spectrum ) the entire range of wavelengths of electromagnetic radiation. • an image or distribution of components of any electromagnetic radiation arranged in a progressive series according to wavelength. • a similar image or distribution of components of sound, particles, etc. , arranged according to such characteristics as frequency, charge, and energy. 2 used to classify something, or suggest that it can be classified, in terms of its position on a scale between two extreme or opposite points: the left or the right of the political spectrum. • a wide range: self-help books are covering a broader and broader spectrum. ORIGIN early 17th cent. (in the sense ‘specter ’): from Latin, literally ‘image, apparition, ’ from specere ‘to look. ’

 

spectrum analyzer

spec trum an a lyz er ▶noun a device for analyzing a system of oscillations, esp. sound, into its separate components.

 

Oxford Dictionary

spectrum

spec |trum |ˈspɛktrəm | ▶noun ( pl. spectra |-trə | ) 1 a band of colours, as seen in a rainbow, produced by separation of the components of light by their different degrees of refraction according to wavelength. • (the spectrum ) the entire range of wavelengths of electromagnetic radiation. • a characteristic series of frequencies of electromagnetic radiation emitted or absorbed by a substance. • the components of a sound or other phenomenon arranged according to such characteristics as frequency, charge, and energy. 2 used to classify something in terms of its position on a scale between two extreme points: the left or the right of the political spectrum. • a wide range: self-help books are covering a broader and broader spectrum. ORIGIN early 17th cent. (in the sense ‘spectre ’): from Latin, literally ‘image, apparition ’, from specere ‘to look ’.

 

spectrum analyser

spec |trum ana |lys ¦er ▶noun a device for analysing a system of oscillations, especially sound, into its separate components.

 

American Oxford Thesaurus

spectrum

spectrum noun a broad spectrum of opinion: range, gamut, sweep, extent, scope, span; compass, orbit, ambit.

 

Oxford Thesaurus

spectrum

spectrum noun a broad spectrum of opinion: range, gamut, sweep, scope, span; scale; variety; compass, orbit, ambit.

 

Sanseido Wisdom Dictionary

spectrum

spec trum /spéktrəm /〖スペクトルの初例は1671年; Newtonによる発見は1666年 〗名詞 複 spectra /-trə /, ～s /-z /C 1 (意見 問題 気分などの )(変動 )範囲 ▸ a wide spectrum of opinions さまざまな意見 2 〘物理 〙スペクトル ; 分光 〘プリズムで太陽光を分解して得られる連続した7色の色帯 〙▸ a radio [sound ] spectrum 電波 [音響 ]スペクトル 3 残像 .