cytophotometryPronunciation: /ˌsʌɪtə(ʊ)fə(ʊ)ˈtɒmɪtri/Definition of cytophotometry noun [mass noun] Biology the investigation of the contents of cells by measuring the light they allow through after staining. Derivatives cytophotometer noun cytophotometricPronunciation: /ˌsʌɪtəfəʊtəˈmɛtrɪk/ adjective cytophotometry in other Oxford dictionaries Definition of cytophotometry in the US English dictionary