photomicrograph Syllabification: (pho·to·mi·cro·graph)Pronunciation: /ˌfōtōˈmīkrōˌgraf/Definition of photomicrograph noun a photograph of a microscopic object, taken with the aid of a microscope. Derivatives photomicrographerPronunciation: /-mīˈkrägrəfər/ noun photomicrography noun photomicrograph in other Oxford dictionaries Definition of photomicrograph in the British & World English dictionary