A Petri dish is a shallow transparent lidded dish that biologists use to hold growth medium in which cells can be cultured. It is the most common type of culture plate. The Petri dish is one of the most common items in biology laboratories and has entered popular culture. A petri dish is used to culture different types of cells, including bacteria and molds. A petri dish is a flat, shallow dish made of glass or plastic with a suitable lid. Petri Dish Made of high quality Borosilicate Glass.