A visual representation of the spectrum of a sound changing through time. / (astronomy) A visual representation of the spectrum of a celestial body's radiation.

A machine for recording spectra, producing spectrograms.

(biology) A species which is in danger of becoming extinct throughout all or a significant portion of its range. / A class or kind whose continued existence is threatened.

(physics) a dark or bright line in an otherwise continuous spectrum caused by the absorption or emission of light, at a single wavelength, by the movement of electrons between energy levels of an atom or molecule

(physics) The portion of the electromagnetic spectrum which is visible to the human eye (red, orange, yellow, green, blue, and violet).

(pharmacology) Any antibiotic that is active against a wide range of bacteria, especially against both gram-positive and gram-negative bacteria.

(physics) Any of several series of spectral lines of hydrogen that correspond to quantum transitions between the various allowed energy levels of the hydrogen atom.

(physics) all the lines in the emission or absorption spectrum of hydrogen; each one corresponding to an allowed transition between quantum energy levels

(physics) The distribution of the intensity of particles or radiation emitted in a nuclear process as a function of energy - a unique signature of each process.

Claims made by a plaintiff for losses that may occur in the future, but are highly improbable. They can not be used as a basis for recovery in tort or contract cases.