histology Syllabification: (his·tol·o·gy)Pronunciation: /hiˈstäləjē/Definition of histology noun Biology the study of the microscopic structure of tissues. Derivatives histologicPronunciation: /ˌhistəˈläjik/ adjective histologicalPronunciation: /ˌhistəˈläjikəl/ adjective histologistPronunciation: /-jist/ noun histology in other Oxford dictionaries Definition of histology in the British & World English dictionary