cytologyPronunciation: /sʌɪˈtɒlədʒi/Definition of cytology noun [mass noun] the branches of biology and medicine concerned with the structure and function of plant and animal cells. Derivatives cytologicalPronunciation: /sʌɪtəˈlɒdʒɪk(ə)l/ adjective cytologicallyPronunciation: /sʌɪtəˈlɒdʒɪk(ə)li/ adverb cytologist noun cytology in other Oxford dictionaries Definition of cytology in the US English dictionary