immunofluorescence

ˌɪmjʊnəʊˌflʊəˈrɛs(ə)ns
ɪˌmjuːnəʊˌflʊəˈrɛs(ə)ns
ˌɪmjʊnəʊˌflɔːˈrɛs(ə)ns
ɪˌmjuːnəʊˌflɔːˈrɛs(ə)ns

noun

a technique for determining the location of an antigen (or antibody) in tissues by reaction with an antibody (or antigen) labelled with a fluorescent dye.