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Definition of Petri dish noun from the Oxford Advanced Learner's Dictionary

Petri dish

noun
petri dish pronunciation English ˈpetri dɪʃ petri dish pronunciation American ˈpetri dɪʃ
petri dish pronunciation English ˈpiːtri dɪʃ petri dish pronunciation American ˈpiːtri dɪʃ
 
a shallow covered dish used for growing bacteria, etc. in