Meaning of (मूलवस्तु) mulavastu in english
As noun :
essence Ex:  It also says of What constitutes the essence of a thing
Suggested : the basic, real, and invariable nature of a thing or its significant individual feature or features
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(मूलवस्तु) mulavastu
can be used as noun.. No of characters: 8 including consonants matras.
Transliteration :
muulavastu