The definition of a spectrophotometer is an instrument used to measure the intensity of wavelengths in a spectrum of light.
An example of spectrophotometer is how an ink manufacturer would figure out how much of one color is present in an ink.
an instrument used for measuring the transmission or reflection of light by comparing various wavelengths of the light
An instrument used to determine the relative intensity of various wavelengths in a spectrum of light.
spectro- +"Ž photometer