photomicrographPronunciation: /ˌfəʊtəʊˈmʌɪkrəgrɑːf/Definition of photomicrograph noun a photograph of a microscopic object, taken with the aid of a microscope. Derivatives photomicrographer noun photomicrographyPronunciation: /-ˈkrɒgrəfi/ noun photomicrograph in other Oxford dictionaries Definition of photomicrograph in the US English dictionary