Meaning of (चापबंध प्रस्तर) chapabandh prastar in english
As noun :
keystone Ex:  Antarctic krill is the keystone species of the Antarctica ecosystem
Suggested : the wedge-shaped piece at the summit of an arch, regarded as holding the other pieces in place
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(चापबंध प्रस्तर) chapabandh prastar
can be used as noun.. No of characters: 14 including consonants matras.
Transliteration :
chaapaba.ndha prastara