IPA: /ˌsaɪtəʊfəˈtɒmətri/
KK: /saitəˈfōtəˌmētrē/
The examination of cells and their chemical components using a special instrument called a cytophotometer.
Researchers used cytophotometry to analyze the chemical composition of the cells in the sample.
Cytophotometry is formed from "cyto-" (from Greek "kytos", meaning cell) and "photometry" (from Greek "photos", meaning light, and "metron", meaning measure). The word refers to the measurement of light in relation to cells, particularly in biological contexts.
Think of 'cells' ('cyto-') being measured by 'light' ('photos') — that's what cytophotometry means.