Definition of photomosaic in English:
 photomosaic
noun ˌfəʊtəʊmə(ʊ)ˈzeɪɪkˌfōdōmōˈzāik
A large-scale detailed picture or map built up by combining photographs of small areas.
 Example sentencesExamples
-  Polished resin-embedded thin sections were prepared from these cores and then used to compile a ×20 photomosaic of the sediment fabrics from the entire White Stone Band.
 -  In a scientist's photomosaic taken in 1972, wetlands along the Five Mile River included a small island surrounded by thin ribbons of water and covered in grasses that typify a healthy New England salt marsh.