absorption spectrum

spectrum /spec·trum/ (spek´trum) pl. spec´tra   [L.]

1. a charted band of wavelengths of electromagnetic radiation obtained by refraction or diffraction.

2. by extension, a measurable range of activity, as the range of bacteria affected by an antibiotic (antibacterial s.) or the complete range of manifestations of a disease.

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absorption spectrum  that afforded by light which has passed through various gaseous media, each gas absorbing those rays of which its own spectrum is composed.

broad-spectrum  effective against a wide range of microorganisms; said of an antibiotic.

electromagnetic spectrum  the range of electromagnetic energy from cosmic rays to electric waves, including gamma, x- and ultraviolet rays, visible light, infrared waves, and radio waves.

fortification spectrum  a form of migraine aura characterized by scintillating or zigzag bands of colored light forming the edge of an area of teichopsia.

visible spectrum  that portion of the range of wavelengths of electromagnetic vibrations (from 770 to 390 nm) which is capable of stimulating specialized sense organs and is perceptible as light.

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absorption spectrum

n.

The electromagnetic spectrum, broken by a specific pattern of dark lines or bands, observed when radiation traverses a particular absorbing medium.

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absorption spectrum,

a plot of percent transmittance, absorbance, logarithm of absorbance, or absorptivity of a compound as a function of wavelength, wave number, or frequency of radiation.

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spectrum

pl. spectra, spectrums [L.]

1. the series of images resulting from the refraction of electromagnetic radiation (e.g. light, x-rays) and their arrangement according to frequency or wavelength.

2. range of activity, as of an antibiotic, or of manifestations, as of a disease.

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absorption spectrum

one obtained by passing radiation with a continuous spectrum through a selectively absorbing medium.

antibacterial spectrum

the range of bacteria susceptible to a particular antimicrobial or class of antimicrobials.

broad-spectrum

effective against a wide range of microorganisms.

visible spectrum

that portion of the range of wavelengths of electromagnetic vibrations (from 770 to 390 nanometers) which is capable of stimulating specialized sense organs and is perceptible as light.