spectrum /spec·trum/ (spek´trum) pl. spec´tra [L.]
electromagnetic spectrum,
electromagnetic spectrum (
·lekˈ·trō·mag·neˑ·tik spekˑ·trm),
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.
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.
electromagnetic spectrum,
the range of frequencies and wavelengths associated with radiant energy.
electromagnetic spectrum (
·lekˈ·trō·mag·neˑ·tik spekˑ·trm),n the entire range of electromagnetic radiation that extends from the longest (radio waves) to the shortest (gamma radiation) wavelengths.
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