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Pronunciation varies by accent · noun
Any of various sciences and technologies dealing with sound transmitted through water..
Use hydroacoustics when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Hydroacoustics means Any of various sciences and technologies dealing with sound transmitted through water..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use hydroacoustics where its definition matches the intended context.
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