| 释义 |
WordReference Random House Unabridged Dictionary of American English © 2024spec•tra (spek′trə),USA pronunciation n. - a pl. of spectrum.
Collins Concise English Dictionary © HarperCollins Publishers:: spectra /ˈspɛktrə/ n - the plural of spectrum
spec•trum /ˈspɛktrəm/USA pronunciation n. [countable], pl. -tra /-trə/USA pronunciation -trums. - Physics
- Physicsan array of light waves or particles that occur in a certain order due to their properties, such as size, wavelength, or mass.
- Physicsthe band or series of colors produced when light strikes a prism or similar instrument:the spectrum of visible light.
- a broad range of different but related ideas, objects, etc.:the full spectrum of political beliefs, from the far left all the way to the radical right.
See -spec-. WordReference Random House Unabridged Dictionary of American English © 2024spec•trum (spek′trəm),USA pronunciation n., pl. -tra (-trə),USA pronunciation -trums. - Physics
- Physicsan array of entities, as light waves or particles, ordered in accordance with the magnitudes of a common physical property, as wavelength or mass: often the band of colors produced when sunlight is passed through a prism, comprising red, orange, yellow, green, blue, indigo, and violet.
- Physicsthis band or series of colors together with extensions at the ends that are not visible to the eye, but that can be studied by means of photography, heat effects, etc., and that are produced by the dispersion of radiant energy other than ordinary light rays. Cf. band spectrum, electromagnetic spectrum, mass spectrum.
- a broad range of varied but related ideas or objects, the individual features of which tend to overlap so as to form a continuous series or sequence:the spectrum of political beliefs.
- Latin: appearance, form, equivalent. to spec(ere) to look, regard + -trum instrumental noun, nominal suffix
- 1605–15
Collins Concise English Dictionary © HarperCollins Publishers:: spectrum /ˈspɛktrəm/ n ( pl -tra / -trə/)- the distribution of colours produced when white light is dispersed by a prism or diffraction grating. There is a continuous change in wavelength from red, the longest wavelength, to violet, the shortest. Seven colours are usually distinguished: violet, indigo, blue, green, yellow, orange, and red
- the whole range of electromagnetic radiation with respect to its wavelength or frequency
- any particular distribution of electromagnetic radiation often showing lines or bands characteristic of the substance emitting the radiation or absorbing it
- any similar distribution or record of the energies, velocities, masses, etc, of atoms, ions, electrons, etc: a mass spectrum
- any range or scale, as of capabilities, emotions, or moods
- another name for an afterimage
Etymology: 17th Century: from Latin: appearance, image, from spectāre to observe, from specere to look at |