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retrovaccine▼ noun[UK: rˌetrəʊvaksˈiːn] [US: rˌetroʊvæksˈiːn]
retrovaccinate▼ verb[UK: rˌetrəʊvˈaksɪnˌeɪt] [US: rˌetroʊvˈæksᵻnˌeɪt]
retrovaccination▼ noun[UK: rˌetrəʊvˌaksɪnˈeɪʃən] [US: rˌetroʊvˌæksᵻnˈeɪʃən]