Meaning of (ध्वनि विज्ञान) dhvani vigyan in english
As noun :
acoustics Ex:  The acoustics of vowels are fairly well understood.
Suggested : (used with a singular verb) Physics the branch of physics that deals with sound and sound waves
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(ध्वनि विज्ञान) dhvani vigyan
can be used as noun.. No of characters: 13 including consonants matras.
Transliteration :
dhvani viGYaana