mujtahid
Concise Oxford English Dictionary © 2008 Oxford University Press:
mujtahid /mʊdʒˈtɑːhɪd/
▶noun (pl. mujtahids or mujtahidūn) a person accepted as an original authority in Islamic law.
– origin Pers., from Arab., active part. of ijtahada ‘strive’.
'mujtahid' also found in these Oxford entries:

