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/əʊˈzɒnəˌmiːtə(ɹ)/ · noun
An instrument for measuring how much ozone is present in a mixture of gases..
The ozonometer of Schönbein described
Use ozonometer when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Ozonometer means An instrument for measuring how much ozone is present in a mixture of gases..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
The ozonometer of Schönbein described
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