- An instrument for measuring the intensity of light of a definite wavelength transmitted by a substance or a solution, giving a quantitative measure of the amount of material in the solution absorbing the light; a colorimeter with a choice of wavelength and photometric measurement. [spectro- + photometer]
* * *spec·tro·pho·tom·e·ter .spek-trō-fə-'täm-ət-ər n a photometer for measuring the relative intensities of the light in different parts of a spectrumspec·tro·pho·to·met·ric -trə-.fōt-ə-'me-trik adjspec·tro·pho·to·met·ri·cal·ly -tri-k(ə-)lē adv
* * *n.an instrument (a spectrometer) for measuring the intensity of the wavelengths of the components of light (visible or ultraviolet).
* * *spec·tro·pho·tom·e·ter (spek″tro-fo-tomґə-tər) [spectro- + photometer] an apparatus for estimating the quantity of coloring matter in solution by the quantity of light absorbed (as indicated by the spectrum) in passing through the solution. Cf. colorimeter.
Medical dictionary. 2011.