:a small shallow dish of thin glass or plastic with a loose cover used especially for cultures in bacteriology
Biographical Note for petri dish
Petriplay \ˈpā-trē\, Julius Richard(1852–1921),
German bacteriologist. Petri was an assistant to the eminent bacteriologist Robert Koch. In 1887 Petri introduced a vessel for growing bacteria that consists of two round rimmed plates, one serving as a cover for the other.