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 spectrum
spec·tro·pho·to·met·ric -trə-.fōt-ə-'me-trik adj
spec·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.